I finally read the sticky thread, got on discord and learned that yes- there is still a community, and that patch3 is applied. Thanks to mbp & ViperDarkstorm for getting me started.
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I realize this thread is a little stale.
In the final mission (minor spoiler) Marduk keeps whooping my ass with constant attacks , summoning high end creatures and casting huge spells. This is the game as it was meant to be played.
@mbp: Are you familiar with Patch 3 from back in the day? If so, would you say Patch 3 has been applied to the GOG version?
I have the original CD, and it runs on my integrated graphics under Wine (Linux, Fedora 33). But the AI was also less aggressive prior to Patch 3 (although not to the extent you described) and the game is less enjoyable. sacrificepatch3.exe just gives an error message (something about DirectX maybe!) on this setup. Dunno if it is even possible to trick the patch into running - I certainly don't have the knowledge or skill.
Well, it's well known issue and we as community of the game strongly recommend people to cap their FPS at 60 before coming into multiplayer as playing above that value is considered cheating.
@ViperDarkstorm: I did a doubletake and then a tripletake when I read that. Is there actually a community who still plays this game online? IP games arranged on Discord or something?
Sacrifice was the only game I really got into. I confess I've never been on Discord myself, and of course I don't really have a working setup. But wow, what a blast from the past it would be to have the regulars kick my tail one more time. :) Might be worth the effort.
 This is all trivia unrelated to the GOG version of sac on Win10.
My memory on patch3 was really bad. sacrificepatch3.exe references DX8, not DX4, and it is a warning, not an error. The program does run, with what I'll just describe as what look like typical Wiine warnings and errors on the console. Afterwards the game has no text on most of the buttons. If I try to start a game anyway I get a dialog Program Exiting: Error processing chunk 'char' of type 'TEXT'
I'll have to reinstall sac if I want to play again.