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Arcanum is actually pretty stable for a Troika game, but as anybody who's played it knows, there's tons of minor bugs, unbalanced items and quite a bit of unused content which simply never got patched or enabled.

Fans to the rescue. Thanks to a modder named Drog, we not only have a fully working widescreen patch, but a huge fan patch that fixes tons of issues. And the great thing is, it adds nothing that wasn't already in the game, just re-enables some things that seem to have been accidentally left out, like extra dialogue options, voice clips, and items.

WARNING: While I and many others have played through the game with these patches, they are technically unofficial, and the modder in question has said he is finished with Arcanum modding, so expect no support. Also, you MUST apply them before you start a new game, to avoid issues with incompatible saves.

Apply these in order from top to bottom:

The latest version (12/28/2009) of the fan patch. Essential. Must have. Get it here.
http://www.terra-arcanum.com/downloads/arcanum/fixes/UAP091225.exe

High-quality townmaps (Better looking in-game maps, also fixes some potential missing map errors):
http://www.terra-arcanum.com/downloads/arcanum/fixes/HQ_Townmaps.exe

And the High Resolution Patch. Weidu-based, so follow the directions to set it up for your system. Will allow you to run Arcanum at pretty much ANY resolution, provides an optional "compact" UI and optional high-res fonts:
http://www.terra-arcanum.com/downloads/arcanum/highres/HighRes1.1a.exe

Version: 1.5.1 (October 4, 2019): http://terra-arcanum.com/drog/uap.html#download

And that should set you up real nice. If you want more info on Arcanum, or any of the other Troika games, head to http://www.terra-arcanum.com and have a look around. Note that they also have some other mods and things for Arcanum, but most of them significantly alter the core game, or are incompatible with the UAP bugfixes. You might want to give the high-quality music patch a spin, but the original music sounds excellent and I wager you won't be able to tell much of a difference. For the purest and most hassle-free experience I recommend you stick with these patches for your first playthrough.

EDIT: If you have any problems with not being able to download, try refreshing the download page, or try the alternate links at this forum post (thanks sanpats), or for the 91225 update and High-res patches try these alternate links, courtesy of Petrell: UAP91225 update and High-res patch.

EDIT 2: Removed old patch version, as apparently version 91225 is stand-alone. Vagabond says it is anyway. Blame him if it breaks.

EDIT 3: Removing contributed torrent link due to torrent site jumping the shark.
Post edited October 16, 2019 by Irrehaare
For those that successfully installed the High Res Patch, and then tried to load Arcanum but the game didn't launch, without any error message, maybe you saw an egg timer for a second and then nothing...
The High Res Patch asks for WIDTH first, then HEIGHT. Make sure you get those values correct for your monitor.
If you really are picking a resolution that is equal to or lower than your monitor's native resolution then as a last ditch effort, if you have an nvidia or ati video card you can use the appropriate control panel to enter custom resolutions for your monitor to try.
Example: I ran the high res bat file and chose width 960, height 600. Not a major bump, just adding widescreen. My monitor doesn't like it though so the game will just not start. I then ran Nvidia control panel and set up a custom resolution of 960 x 600 at 75hz (60hz should be fine too). With that setting locked in, running the game now works, at 960 x 600.
The patches work fine for me...except the very last UAP (UAP091225.exe).
Why? It thinks that I'm not using an English-language version of Arcanum for some dumb reason, when this is unquestionably a US, Sierra-published retail release of Arcanum (which I bought in a thrift store well before GOG's unprecedented Activision deal).
Even more bafflingly, the second-to-last UAP (UAP081229.exe) DOES work...
What gives? It clearly works for a lot of other people, given that I haven't heard much in the way of complaints about it not installing...
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NamelessFragger: The patches work fine for me...except the very last UAP (UAP091225.exe).
Why? It thinks that I'm not using an English-language version of Arcanum for some dumb reason, when this is unquestionably a US, Sierra-published retail release of Arcanum (which I bought in a thrift store well before GOG's unprecedented Activision deal).
Even more bafflingly, the second-to-last UAP (UAP081229.exe) DOES work...
What gives? It clearly works for a lot of other people, given that I haven't heard much in the way of complaints about it not installing...

If you are running Vista / Win 7, you need to right-click the exe's and click "Run as administrator" else the OS's tend to block some disk writes. Newest patch works well with the GOG version for me . . .=)
Edit: if you are running a retail version, you may need to download and install all the patches the publisher issued before the last UAP will work. GOG's release is the last patch released by the publisher. Ver 1.0.7.4 is the last official patch, I believe.
To display your version info - open Arcanum and press the V key.
Post edited February 13, 2010 by Stuff
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NamelessFragger: The patches work fine for me...except the very last UAP (UAP091225.exe).
Why? It thinks that I'm not using an English-language version of Arcanum for some dumb reason, when this is unquestionably a US, Sierra-published retail release of Arcanum (which I bought in a thrift store well before GOG's unprecedented Activision deal).
Even more bafflingly, the second-to-last UAP (UAP081229.exe) DOES work...
What gives? It clearly works for a lot of other people, given that I haven't heard much in the way of complaints about it not installing...
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Stuff: If you are running Vista / Win 7, you need to right-click the exe's and click "Run as administrator" else the OS's tend to block some disk writes. Newest patch works well with the GOG version for me . . .=)
Edit: if you are running a retail version, you may need to download and install all the patches the publisher issued before the last UAP will work. GOG's release is the last patch released by the publisher. Ver 1.0.7.4 is the last official patch, I believe.
To display your version info - open Arcanum and press the V key.

I should have mentioned that I do install the official 1.0.7.4 patch beforehand and run UAP091225.exe with admin rights, but that apparently makes no difference.
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NamelessFragger: I should have mentioned that I do install the official 1.0.7.4 patch beforehand and run UAP091225.exe with admin rights, but that apparently makes no difference.

My solution would be to uninstall the retail version, blow six bucks on the GOG release and play on . . .=)
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Stuff: If you are running Vista / Win 7, you need to right-click the exe's and click "Run as administrator" else the OS's tend to block some disk writes. Newest patch works well with the GOG version for me . . .=)
Edit: if you are running a retail version, you may need to download and install all the patches the publisher issued before the last UAP will work. GOG's release is the last patch released by the publisher. Ver 1.0.7.4 is the last official patch, I believe.
To display your version info - open Arcanum and press the V key.
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NamelessFragger: I should have mentioned that I do install the official 1.0.7.4 patch beforehand and run UAP091225.exe with admin rights, but that apparently makes no difference.

That is odd :/. I am running the same retail version (when Sierra still had it, gotta find my great manual if I haven't lost it) and doing the 1.074 -> UAP [latest] worked fine for me. I don't install to Program Files by habit (I have it installed in C:\Old Games\Arcanum), have you tried installing to a different location?
Also - do you have a non-US version of Windows by any chance? (with your location as US I doubt it but troubleshooting requires some pretty crazy sounding questions :p)
Do you have any extra language packs installed? Can you post a screenshot of the exact error that comes up when you try to install the latest UAP?
My standard troubleshooting for something like this is to cleanly uninstall the game/app (making sure all registry entries are gone) and then trying fresh [installing games outside of Program Files helps alot in many cases]. If you are using a 32 bit version of windows you can try Revo Uninstaller (it doesn't support 64 bit windows for some reason, and I haven't installed to see if it works properly on my new Win 7 x64 copy yet) - it will search for leftover registry entries and file detritus for you (and its free :D).
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carlosjuero: I should have mentioned that I do install the official 1.0.7.4 patch beforehand and run UAP091225.exe with admin rights, but that apparently makes no difference.

The disk version (Sierra euro release) I have works perfectly. And using official 1.0.7.4 patch downloaded from terra-arcanum, all drog's patches installed and work without problems. On the other hand I have 32-bit WinXP Pro SP3 (finnish language with additional japanese langueage pack installed) as my os.
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NamelessFragger: I should have mentioned that I do install the official 1.0.7.4 patch beforehand and run UAP091225.exe with admin rights, but that apparently makes no difference.
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carlosjuero: That is odd :/. I am running the same retail version (when Sierra still had it, gotta find my great manual if I haven't lost it) and doing the 1.074 -> UAP [latest] worked fine for me. I don't install to Program Files by habit (I have it installed in C:\Old Games\Arcanum), have you tried installing to a different location?
Also - do you have a non-US version of Windows by any chance? (with your location as US I doubt it but troubleshooting requires some pretty crazy sounding questions :p)
Do you have any extra language packs installed? Can you post a screenshot of the exact error that comes up when you try to install the latest UAP?
My standard troubleshooting for something like this is to cleanly uninstall the game/app (making sure all registry entries are gone) and then trying fresh [installing games outside of Program Files helps alot in many cases]. If you are using a 32 bit version of windows you can try Revo Uninstaller (it doesn't support 64 bit windows for some reason, and I haven't installed to see if it works properly on my new Win 7 x64 copy yet) - it will search for leftover registry entries and file detritus for you (and its free :D).

Actually, I install all of my games in a "C:\Games\*game name*\" folder out of habit, and have done so since the Win9x days-well before Vista's UAC became a possible issue with anything installed to Program Files.
Yes, I run US copies of Windows, with no extra language packs (given that I'm only monolingual and all, as much as I hate to admit it). That UAP spits out the same error on Windows Vista 32-bit and Windows 7 64-bit (though I just replaced the former case of Vista with Windows 7 64-bit as well, but have yet to re-install Arcanum on this system).
You had to bring up the manual, though. I want to slap whoever put this boxed copy of Arcanum in a thrift store with a manual that has several holes poked through it, tears on the cover, the last two pages cut in half, and pretty much ruined. Still sort of readable save for the last two pages (which apparently aren't that important), but now I'm wishing for the Microsoft Courier to become reality already so I can read electronic manuals on it in addition to taking notes and sketching.
Please don't scorn me, but do ALL the patches intefere with saves?
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prakaa: Please don't scorn me, but do ALL the patches intefere with saves?

Don't know about others but .. I have the UAP, HR Maps and HR patch installed and so far . . no problems with saving . . . so far . . .=)
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prakaa: Please don't scorn me, but do ALL the patches intefere with saves?
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Stuff: Don't know about others but .. I have the UAP, HR Maps and HR patch installed and so far . . no problems with saving . . . so far . . .=)

Sorry, worded it badly
Which patched intefere with save games from the Vanilla version?
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prakaa: Sorry, worded it badly
Which patched intefere with save games from the Vanilla version?

Unofficial Arcanum Patch (UAP) at least. I'm not sure if High Quality Townmaps and HQ Music can be applied without UAP thought (if they can be applied they should not interfere with saves) so that'll leave you with only High res patch.
Post edited February 15, 2010 by Petrell
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prakaa: Which patched interferes with save games from the Vanilla version?

There were two instances where the save games were missing or thought to be corrupted (game wouldn't start) I believe.
1) If you were using Vista / Win 7 and checked the "Run this program as an administrator" under the Compatibility tab in the game shortcut after saving the game with it unchecked. I think it was addressed in this post. Apparently, if your Vista/Win 7 account is not an Administrator account (plain User account), after check-marking the "run as admin", Vista and Win 7 saves the game in a different location but did not delete or corrupt the existing save files, you only needed to move them to the save directory the game was using after check marking the option. If your account was an Administrator account, this would not occur.
2) If you installed the HR patch on Vista or Win 7 without right-clicking it and clicking "Run as administrator . . . it would not install correctly and the game would not start. Using C:\Program files\GOG.com\Arcanum\HighRes.bat to un-install the HR patch fixes the problem I believe. This post by Misanthrope is an example of this working to resolve the problem. I don't think Misanthrope reinstalled the HR since there were no follow up posts but . . . i think reinstalling by righ-clicking the HR patch and using the "Run as admin" method will allow the patch to install without incident since many, myself included, have installed the patch without a problem.
Hope this helps . . .=)
Edit : Porkdish also made some good points about the HR patch in this post.
Post edited February 15, 2010 by Stuff
Hello everyone :)
Just bought the game at GOG and I'm wondering is there any way to change the language to german?
Many thanks in advance / Danke im voraus :)
German from Croatia ? Kewl ;)
As far as I know there is no way of doing so, but I have read on several occasions, that mixing a non-english version of the game with the unofficial patch might result in problems, because the UAP was made for the english version.