Installed it, run as admin, tried all the compatibility mode and nothing. Nothing happen when I try to download my game or to launch the program.

Any help?

Try to uninstall, clean all reg keys (if any) and install again. This should work.
By the way you may also want to download the latest version. http://www.gog.com/downloader

Also make sure you are in 'downloader mode' for downloading games

(see pic)

I never had any luck with the downloader, it always bugged out on me... I just download through the browser myself.. =/ Shame really, I wish the downloader did work for me because I would use it for sure.

Thanks for the replies all, I already done (if it's not three times) every single thing that everyone told me to do and nothing work. First time using gog.com and I don't think I'll use it in the futur.

I have the latest gog downloader version. I have tried restarting PC and reinstalling.

When I try to launch to download game or double click the GOG.com Downloader.exe;

Absolutely nothing happens. It was working just fine a few days ago.

What's up?

Okay, so.. read somewhere about getting .Net 3.5 so I did that but I think it's stupid because I'm on XP SP3 and it will auto update back to the latest..

I think what may have happened was in browser was on account/beta rather than just account.. weird but i think reverting back to just gog/account in browser url worked. Downloader seemed to work after that.

Maybe is a problem from GOG side, try to send an email.