Hello, I only own the Epic Games version.

There is an issue with shadows when playing in 3D SDS, and the fix is to rollback to build 813 (on Steam) which is the last known version to not have this issue.
Unfortunately it isn't possible to rollback to an older build on Epic (Thanks Tim).

Is the version 813 version (or a matching one on GOG) is availible on GOG ?

Edit : I'm talking about Rise of the Tomb Raider.

Ok so according to gogdb website, the game was released on GOG on the 2025-09-03 so I don't think there's the build 813 (which is from 2018) on GOG :/