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Please try adding the game from a different browser and let us know if that changed anything.
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Firek: Please try adding the game from a different browser and let us know if that changed anything.
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barry_guy: I just tried firefox and IE 8. With firefox same problem as chrome, nothing happens, but with IE 8 two error boxes appear that say:

"gogdownloader://the_witcher_2_assassins_of_kings_au/is not a valid Win32 application."

and

"Unable to open this helper application for gogdownloader://the_witcher_2_assassins_of_kings_au/

The protocol specified in this address is not valid. Make sure the address is correct, and try again."


I've also tried deleting and redownloading the launcher, no luck there.
We still haven't nailed this down (browsers are varied and temperamental creatures...), but please try this support article, last point:
http://www.gog.com/en/support/support_view/Problems_with_the_GOG_Downloader
Post edited May 17, 2011 by Firek