Repacks use compression algorithms that trigger false positives (especially on ali213.dll or steam_api.dll wrappers). Add the install folder to your AV exclusion list.
However, if you’re working on a for the game (e.g., mod, fan patch, analysis, or game design article), I’d be glad to help with: blade of darkness v109gog repack
Because the game's engine is notoriously finicky, the community has written extensive guides (often referred to as "bibles" or "papers" in modding circles) to optimize this specific GOG repack. The Blade of Darkness "Fog Fix": or game design article)