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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 some reason I just can't start the game in fullscreen mode. The screen goes black as if the game is about to start but then crashes to desktop after a second.

If I set the game to start in windowed mode it starts without any issues.

I have not been able to find any reason why this is happening or any fixes to this problem.
I installed the latest UAP 1.51 but can't get the res set to 1920x1080. it defaulted to 720p anybody help!
Nevermind I got it. In the WS folder you edit the conf ini file then run install bat. Done.
Post edited December 14, 2019 by smuggly
No need for the HQ Music or HQ townmap or HighRes. As previous poster mentions it defaults to 720. But now it is as easy as it has ever been to play this game in all its glory.

***NOTES from UAP:
UAP Base
All the bug fixes plus Extra Animations, Extended Ambient Tracks, HQ Townmaps and HQ Music.
High Resolution Patch
Allows the game to be played at any resolution. Defaults to 720p. Improves Windows 10 compatibility.
Official DLC
Adds 7 additional mini-campaigns. You can choose them in Options -> Game -> Module.
Beta Content
Various things restored from pre-release versions of Arcanum.
Misc Mods
Various miscellaneous mods and additions.

NOTE: That most of this is optional and it asks what you want to install. It might be time to unsticky this post.
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Kohleran: (...) It might be time to unsticky this post.
Why on Earth should GOG do that, when the OP even edited the top post to include the 1.5(.1) UAP? Following its link, you will easily find the same info that you have been spamming in every thread (including a new one you created... don't know what for)
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Kohleran: (...) It might be time to unsticky this post.
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Links: Why on Earth should GOG do that, when the OP even edited the top post to include the 1.5(.1) UAP? Following its link, you will easily find the same info that you have been spamming in every thread (including a new one you created... don't know what for)
Kudos that it has been updated. That will work too.

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Kohleran: (...) It might be time to unsticky this post.
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Links: Why on Earth should GOG do that, when the OP even edited the top post to include the 1.5(.1) UAP? Following its link, you will easily find the same info that you have been spamming in every thread (including a new one you created... don't know what for)
I created one because at the time there wasn't one that I saw. That ok with you? (not that I care, come to think of) (jerk)
Post edited January 26, 2020 by Kohleran
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Kohleran: Kudos that it has been updated. That will work too.

I created one because at the time there wasn't one that I saw. That ok with you? (not that I care, come to think of) (jerk)
Yeah, it's been working since October... in a stickied thread. As it also has been in the one you actually posted in.

Good luck with that.
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Kohleran: Kudos that it has been updated. That will work too.

I created one because at the time there wasn't one that I saw. That ok with you? (not that I care, come to think of) (jerk)
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Links: Yeah, it's been working since October... in a stickied thread. As it also has been in the one you actually posted in.

Good luck with that.
I don't know that. I didn't see it. Shows the post being updated in Jan 28th. So it looks good now is all I see. And you are still a jerk.
first time playing, does anyone have recommended options for version 2 of the unofficial patch?
I've installed it fresh with the extra dlc and race mod, not sure about the beta or minsc mods though.
also noticed another user posted an infograph on character construction, i can't post a link here but its in the thread "Arcanum Unoffical patch 2.0 released (new races added)" user goral posted.

personally i don't worry about min maxing with crpgs (like baldurs gate) and just go with the flow of the game optimizing somewhat as i go so i hope that'll work here lol.
Does the 2.0 patch install over the 1.51? Or do you have to reinstall everything?
Thanks
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smuggly: Does the 2.0 patch install over the 1.51? Or do you have to reinstall everything?
Thanks
In the thread OriginalDaniel pointed you to, the creator says that he recommends doing a clean install.
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smuggly: Does the 2.0 patch install over the 1.51? Or do you have to reinstall everything?
Thanks
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addams013: In the thread OriginalDaniel pointed you to, the creator says that he recommends doing a clean install.
Thank You I didn't see that.