I recently opened my Minecraft Launcher to play Minecraft, and it needed to update. After said update I had to login again. I logged in to the same account I purchased the game on, of which I still have the PayPal reciept for, and it said I could only play the demo and did not own the game.
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Please follow the instructions in MCL-16570.
Hello! This appears to be a duplicate of MCL-16570. Please see the Moderator Note on that ticket for a potential fix to your issue!