Could someone please get Gog galaxy to alternatively (with just one click) install the pc games I have bought in a c:\GOG main folder instead of the disaastrous program files(x86) and program files folders? I have windows 8.1, and putting pc games into those folders has made things much worse, especially as regards adding mods. Thanks!

From what I recall, it should use "C:\GOG Games" by default. If it doesn't, click on the GOG icon on the top left of the Galaxy Window, click Settings, Downloads, and change the "Game Installation folder" and the "Other Downloads folder" fields.