OK, this is pretty interesting. Apple now makes certain Apps free which used to be paid for Apps like iMovie, Pages, etc. If you had the paid for versions, then current ownership can get a bit confused in the App Store. You have have to “Accept” new ownership of these now free Apps in the Mac App Store. This article explains how to do that using two typical scenarios. If the Mac App Store is asking you to “Accept” an App, then read this article explaining why and how to fix it.