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Same thing happened to me on all of my computers. Vista 32bit, Win7 32bit… The latest update broke my Avast installation on my older Vista32 desktop so I kept ignoring the prompts to upgrade my Win7 machines. I finally tried it today and it did the same thing. Repairing doesn’t work, you have to re-download and reinstall. Any way to avoid this in the future? It’s a lot of trouble to go through for that “marketplace” tab.
edit: Sorry, my problem is with the Free edition of Avast. I just noticed OP was referring to the paid version but it sounds like a similar problem with the updates.