Nicholas Steel's post in Endless load screen after entering the ruins in the first quest. was marked as the answer
Okay, well if you run Steam as an administrator (It won't start up automatically with Windows as an Administrator) then launch the game via Steam the game should inherit the Administrative Privileges from Steam. Why do you have 2 copies of the same game?
Nicholas Steel's post in PC DVD (as gift) but no drive! Can I download? was marked as the answer
if it's a copy for Steam than yes, you can download it. This is likely also the case for a GOG copy of the game.
Nicholas Steel's post in Loot missing, 2.03 was marked as the answer
Do you have the option to access your Stash anywhere, enabled? If so the item may have been transferred to there if the party member picking up the item has their inventory full.