Swedrami: Haven't bought it myself yet (still on the fence due to whether this is the international uncut version or not) but I heard someone mentioning two distinct executables, a standard DirectX9 one and a (HD?) DirectX10 exe.
Maybe that answers at least one part of your question(?).
Well, if it is anything like the Steam version there is a thread over there saying that it is uncensored unless German language is selected.
https://steamcommunity.com/groups/foruncut/discussions/13/527274088386048322/
I might install the GOG version later and take a look for myself.
As for the DirectX 9 and 10 options, it looks like the fully patched (official) version of the game has both of those options present, but there is no 64-bit executable (according to the PCGamingWiki). There are applications that can set 64-bit large address awareness on executables, though, if needed.