Everything is done very simply, download the old version of the game 1.43.7, or earlier. Open this pribluda, edit what you want (the most important thing is the gear editor), then transfer the save (I have it in the game folder) to the new version.
Unepic: Save Game Editor (For game version 1.43.7) Free Download
Does it work for Steam? I find it difficult to say, most likely yes.
