PSA: locaiton of the file you need to save to see both endings

[Adidas]

When you are asked to make a decision - when ewa asks you to unplug her - go to C:\Users\<username>\AppData\Local\ParadiseLost\Saved\SaveGames and copy the file.

You can now finish the game, see the ending and restore the file to see the second one (and bizarelly, get both achievements).

Simple but useful to know.