If you download the unofficial patch and apply it then the high res patch will install.
The GOG version comes pre patched with some old version of an unofficial patch I think. It'd be better if they just supplied the original exe.
mirror with hq music and town maps. The music is worth the better quality recording. https://mirror.aleturo.com/Games/Arcanum
also now ddraw compat wrapper doesn't seem to work, the version supplied with the high res patch or the latest one. dgvoodoo seemed to be freezing up sometimes, gl