Hi buteman - it appears that the updates for AVG free and 'paid for' versions are not compatible. Their notice gives details as follows: "Important notice for AVG Free Users.
The listed program updates should not be used for the AVG Anti-Virus Free Edition. AVG Free users can perform the update directly from within the program, or download updates from AVG Free Advisor website...."
Click here gives further details and the last current update for the various paid versions too. TC.
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