This problem has probably come up before, but since I really don't feel like reading through 17 pages to find the solution, I'll just post again.
As of yesterday, I've been having problems with the downloader. Whenever I open it, whether by shortcut or the file, all it does is open a new bar that says "downloader" on the windows menubar at the bottom of the screen. The actual window never opens. I have tried reinstalling the downloader multiple times, but I'm still getting the same problem. Anyone have a solution?
By the way, I'm running Vista 32-Bit, if that helps.
Heres how I fixed this problem.
If that doesn't help, try deleting the Adobe\AIR\ELS and com.gog.downloader.***** folder(s) located inside this folder:
for Windows Vista and 7 - C:\Users\[USERNAME]\AppData\Roaming\ .