i had the same problem, here is your answer from the creator.

There is not a new version avaialable, 0.9.9 is the latest. We just modified our web server to provide more robust service, but unfortunately, one of the side issues is that it screwed up the auto-update function. Unforunately there is no way to turn off the warning, you just have to close it and move on. The next version will be out very soon and will have this problem fixed as well as the option to turn the auto-update notification off.

I am sorry, this is an annoying bug.

Shaun


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Shaun Sidwall
Gnotella Creator