Originally Posted by killias2 
I bought the GoG version of SR2 (non-reboot) before realizing it wasn't the best version. I think I also own it on GamersGate (in a bundle or something), but the main version I own is a boxed copy I got for 1 dollar at a "Five Below" store.
Craziness.
Check your GOG account. They updated plain SR2 to Reboot ages ago.