Fixes loads of bugs, inconsistencies, and discrepancies. Restores, adds, changes, and improves some content for a more logical execution and appearance. Now better and improved, plus fully inclusive, with HQ maps, HQ music, high resolution patch, official DLCs, restored prerelease content, and other game improving mods.
Found on Terra-Arcanum.org. Developed by Drog Black Tooth.
Visit it for more details, detailed changelog, FAQ, feedback, and updates. Also, the author has the donation button on the page, so make sure to give them some coins, so they could introduce more improvements to this patch in future.
Works with Steam/GOG/retail releases of Arcanum patched to the latest official v188.8.131.52.
To install, launch the installer and point to Arcanum's (clean) installation directory, and then launch the game as usual.
Starting a new game is obligatory.