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Me too. Did not like Firefox so uninstalled, then had to figure out how to get internet back!. Sent a letter to GOG, said they will check it out.
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amiro: I also had this problem on two different machines. However using different browser solved problem for me and gog downloader started correctly.
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PDGoose: This worked for me, too. Tried adding it to Gog Downloader from IE but got "(EI41): Bad Signature" but Firefox added it to the downloader, no problem.
I have the same problem too. I can download everything else fine, but when adding 'King's Bounty' to the downloader I get '(EI41): bad signature' shortly after it tries to 'fetch' the information for the download.
I've had the same problem. So far, I have always used Opera to add to the downloader, and everything worked nicely.
Until now.
So, I switched to Firefox, and could add it to the downloader. Now waiting to see if it works.
As to the MD5 hashes, I believe the downloader does that actually at the end of the donwloading process, before it marks it complete.