Hi, I bought MOO 1 and 2 but am receiving the following message: Firefox doesn't know how to open this address, because the protocol (gogdownloader) isn't associated with any program.

Ensure that the GoG Downloader option is set to off on the game's download page. If you have it installed and you're getting this error then something is keeping it from handling the download; if you don't then having the setting turned on is the source of the problem.

Thanks Garran, that fixed the problem for MOO but not MOO 2

MOO1 and MOO2 are both included in a single download. Do you mean MOO3?