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: https://sdk.play.date/1.10.0/Inside%20Playdate.html#pdxinfo
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!