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Mean.Jim: Sorry to necro this, but I came bearing a solution. For some reason, the manifest headers in the game's EXE file is set to request admin when run, but there is a way around it.

Shadow of Chernobyl is the easiest, just downgrade the game to version 1.0004 or 1.0005 and its EXE doesn't require admin privileges. It's recommended to run these versions for single player anyway since the 1.0006 version, although official, was recalled due to extra bugs introduced. A lot of mods also don't work with 1.0006. There are instructions to do this over here.

For Clear Sky and Call of Prypyat, modify the game's shortcut, make sure to remove any compatibility options set by the GOG installer, or just make a new shortcut. Then in the target box paste this in front of the text already there.
This worked perfectly for my Steam install, thank you. Had to manually add in the InstallLang=en variable to my Shadow of Chernobyl registry key but once done the downgrade patcher worked without a hitch and elevated privileges requests vanished. Big relief overall and a decent QoL improvement. Highly recommend making the effort to take this step for new SoC players.
Post edited October 29, 2024 by Stiffkittin
I would highly recommend using OpenXRay instead. It's native 64-bit, works on modern OSes and hardware, so it's better when running lots of mods, especially textures. Even if just playing vanilla, OpenXRay is still a big improvement.