Hi! Yes I have the newest version, I've just downloaded it.
I've turned on the gog downloader mode at "my games", I clicked on the "Game installer" and it opened a new tab on my browser like "Page cannot be display" or something like that. The link was gogdownloader://game_name.
Sorry, I don't know exactly the english Firefox's typical error message
Have you been previously using the older version 0.9? If so, go to Firefox -> Options -> Options -> Applications and find on the list item named "gogdownloader" and change its setting to default or remove. Restart the downloader. Hope that helps.
If this isn't the case, send me a PM, we'll sort it out.
The Downloader works fine for me as downloads go. It has some issues though with displaying text in settings screens. The labels are drawn oversized and overlap other controls. See the attached image. I confess I tweaked a little the current windows theme, but I don't have these kind of problems with any other apps. Win7 64 here.
There's no urgent need for a fix as far as I'm concerned, the downloader is functional. I only thought the developers would like to know.
Are you using different theme or font size in Windows?