I am not able to install GOG Galaxy. First upon launch I was getting "Error code: 21" message, that the installer failed to initialize. Now, after I rebooted my PC, the executable just won't launch at all. I click on the .exe file and nothing happens. I wasn't able to find any information on this "error 21" that would help. So what's the deal?

I found a workaround to the problem. Found a link to an offline installer of the old version of the launcher on some forum and the installation went fine. Just had to update it afterwards. So something was up with the connection in the web installer. Case closed I guess.