I sometimes get the same message when trying to download some content from my purchase history. The difference is, I'm 100 percent sure that I actually DO own the item in question. In fact, I own the Store, MMAO machine congratulates me on owning everything, and still there are some items in my that I can't download because I don't own them according to the launcher.
Oh, and it's not possible to delete anything from your purchase history. It's literally meant to be a record ("proof of purchase") of everything you ever bought from the Store - including gifts to other people. So you aren't supposed to be able to edit it. :smile:
There should be a caption stating when you bought the item (or if it's a gift, the date and the name of the person who gave it to you.)
Have you tried looking up the item in the Store itself? If it has a blue "download" button instead of a price, that's also proof that you bought it at some point. The store is just really glitchy lately.
