Hello guys how do i launch mods with the GOG version of SOMA?
When i click on the Modlaucher.exe it gives me a error about Steam missing on my PC! Why do i need steam if i'm using the GOG version?!

You probably have the wrong "ModLauncher.exe." I had the same issue before. Make sure you grab this one from ModDB:

http://www.moddb.com/mods/thedreamerscustomstorycollection/downloads/gog-modlauncher

Drop that into your C:/. . . GOG Games/SOMA folder. Double click and it should give you the option to play games with add-ons. Whatever mods you have in your mods folder should show up, check it, and hit launch. If you want to play from a save you already have you'll need to copy your saves from "C:Documents/MyGames/SOMA/Default" to your "C:Documents/MyGames/SOMA/DefaultwithAddons" folder.

Thanks that worked. :)