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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
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Narwhal: Two questions :
Does it break saved games ? My GF started a new game and will not restart over.
Does anyone has the patch note with the added content / fixes ? Cannot find it.
Thank you very much

I can help with the first. It will break your saved games. As for the second question, do the links in the first post not work anymore?
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Narwhal: Two questions :
Does it break saved games ? My GF started a new game and will not restart over.
Does anyone has the patch note with the added content / fixes ? Cannot find it.
Thank you very much

Petrell posted them on the previous page:
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Petrell: I'm also hosting UAP and High res patch so you can try these links instead:
Unofficial Arcanum Patch Version 091225
Arcanum High Resolution Patch Version 1.1a
Here's also readme for UAP and it's extra content component:
UAP readme
UAP: Extra Content readme
Unfortunately I can't host the high quality town maps or lossless soundtrack because I don't have enough space on my site.
Post edited January 31, 2010 by phanboy4
Since Petrell didn't have space for the HQ town maps and music files I put them up on a webspace I own:
http://dl.ck-services.net/files/arcanum-mods/HQ_Townmaps.exe
http://dl.ck-services.net/files/arcanum-mods/HQ_Music_MP3.exe
I will keep them up there for as long as necessary (unless bandwidth starts becoming a concern)
Oh !
Thank you for the answer. I am the kind of dude who say "Read the previous answers before asking questions" usually, but that time I am at fault ;)
Someone sticky this for convenience
Glad to see unofficial patch works, great release GoG!
I keep gettin an error msg when i install the highres patch.
"ERROR Installing [High Resolution Patch], rollong back to previuos state" in the dosbox.
Has anyone else had this problem n now how to fix?
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Thomzy_3000: I keep gettin an error msg when i install the highres patch.

I believe I had the same problem under Windows 7 x64. You'll need to run the patcher in Administrator mode, but right clicking on the patcher in explorer and selecting 'Run as administrator' did not work for me. I had to run it from an elevated command prompt.
Post edited February 04, 2010 by shadearg
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Thomzy_3000: I keep gettin an error msg when i install the highres patch.
"ERROR Installing [High Resolution Patch], rollong back to previuos state" in the dosbox.
Has anyone else had this problem n now how to fix?

As shadearg stated, you hav eto use the 'run as administrator' command in Win 7 x64, but mine worked with the right click....don't you just love errors that manifest in different ways. It is working for me now though, and is worth it to get it going. Let us know how it turns out for you.
So I installed the patches (unof patch, hi-res, high quality town maps, etc)
First off - as other people have reported, my game no longer launches.
Secondly - someone said this screws up your savegames? Ouch.
Is there ANY way to uninstall the patches and get my savegames back? For instance - is there a file in which they are saved in that I can copy, reinstall the game, then paste back into the Arcanim folder?
It would be a real bummer if I would need to start over again.
I realize that this is pretty much all my fault for not reading up on the patches themselves, but I think the OP should make it clear if it screws with your savegames.
Any help would be GREATLY appreciated!
EDIT: I realize now that OP DID warn users - I was just an idiot and didn't see it.
Post edited February 03, 2010 by Misanthrope
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Misanthrope: So I installed the patches (unof patch, hi-res, high quality town maps, etc)
First off - as other people have reported, my game no longer launches.
Secondly - someone said this screws up your savegames? Ouch.

I would uninstall the High Res patch first ( C:\Program files\GOG.com\Arcanum\HighRes.bat ) and see if the game will launch. The HR patch seems to be the problem most of the time.
If you created a restore point before installing the patches (Start, Programs, Accessories, System Tools, System Restore) you can restore back to that point to return your system back to the state prior to the patch install. Windows system restore does not delete user files.
** if you restore to a point prior to the game install, manually delete the game directory ( C:\Program files\GOG.com\Arcanum ) prior to reinstalling the game. **
I am NOT referring to the manufacturers (Dell, HP, Gateway, etc) system restore but to the MS Windows restore program.
To be on the safe side, check the thread for the location of your save game files and make a backup first.
If you prefer not to use System Restore then uninstalling and reinstalling the game may be the only option as I have found no info on uninstalling the mods. Other community members may be able to provide mod uninstall instructions.
Edit: if you do uninstall / reinstall . . . check C:\Program Files\gog.com\ for any Arcanum directories that the uninstall did not remove and delete them manually prior to reinstalling the game . . . =)
Post edited February 04, 2010 by Stuff
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Misanthrope: So I installed the patches (unof patch, hi-res, high quality town maps, etc)
First off - as other people have reported, my game no longer launches.
Secondly - someone said this screws up your savegames? Ouch.
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Stuff: I would uninstall the High Res patch first ( C:\Program files\GOG.com\Arcanum\HighRes.bat ) and see if the game will launch. The HR patch seems to be the problem most of the time.
If you created a restore point before installing the patches (Start, Programs, Accessories, System Tools, System Restore) you can restore back to that point to return your system back to the state prior to the patch install. Windows system restore does not delete user files.
** if you restore to a point prior to the game install, manually delete the game directory ( C:\Program files\GOG.com\Arcanum ) prior to reinstalling the game. **
I am NOT referring to the manufacturers (Dell, HP, Gateway, etc) system restore but to the MS Windows restore program.
To be on the safe side, check the thread for the location of your save game files and make a backup first.
If you prefer not to use System Restore then uninstalling and reinstalling the game may be the only option as I have found no info on uninstalling the mods. Other community members may be able to provide mod uninstall instructions.
Edit: if you do uninstall / reinstall . . . check C:\Program Files\gog.com\ for any Arcanum directories that the uninstall did not remove and delete them manually prior to reinstalling the game . . . =)

Uninstalling the high-res patch completely fixed everything. My saved games work, etc. Thanks so much for your help!
I hope I'm not repeating some info already out there, but here goes:
I heard mention of a patch that allows one to level up beyond Level 50. Terra-Arcanum to the rescue. Under Downloads -> Arcanum -> Arcanum Hacks you will find two updates that are supposed to allow you to get to level 127:
First one: arcanum_uptolevel127_1074.zip
http://www.terra-arcanum.com/downloads/arcanum/hacks/arcanum_uptolevel127_1074.zip
Second one: Arcanum Universal level cap remover v0.0.1
http://www.terra-arcanum.com/downloads/arcanum/hacks/arcanum50patch-0.0.1.zip
The first one being first and all, I tried it out.... first. Didn't work since it's a new Arcanum.exe that doesn't take into account the GOG no-cd executable. It simply won't run for me since I have no CD.
The second one seems to work, at least in that it allows the game to load. It also allowed me to load a saved game so it doesn't appear to have borked those. However, I don't yet know if it will actually get the characters past level 50 since I have a ways to go before that becomes an issue.
Anyway, just thought I'd put it out there so someone else with the GOG version doesn't waste an extra 10 minutes on the first hack.
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HereForTheBeer: The second one seems to work, at least in that it allows the game to load. It also allowed me to load a saved game so it doesn't appear to have borked those.

Thanks for that info, I was holding off going for that level cap remover for fear of losing the saves.
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_Varyag_: Someone sticky this for convenience

Seconded. For now you can favourite though.