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Thank you! As far as I can tell, the issue is that your demos' pdxinfo files are missing a field named bundleID, which stores a unique identifier for each game. Here's some documentation about the pdxinfo file that might be helpful:

Hey there! I went and updated the pdxinfo file and added what appears to be required. Could you do me a favor and redownload the pack and see if sideloading one of the demos works? Thanks a ton!

Thank you! It looks like almost all of them sideload just fine now. The only exception is the sine wave demo, which appears to be missing a pdxinfo file.