I am trying to make a 2024 version of my paladin. I can pick Oath of Devotion because it is free. I can pick the Xanathar’s options and Oathebreaker because they are from 2014 content I own, but I cannot pick the 2014 version of things I own if they’re in 2024 content I don’t own. I can’t use the Oath of the Ancients.
If you’re looking for another app with all the 5E content, it doesn’t exist, because everything except the SRD is copyrighted. So your options are to find some character building spreadsheet with all the options, try one of the suggestions in this thread, or pony up more cash to rebuy all the stuff you already bought.
I’m just venting at the moment. Always open to suggestions, but not actively looking to move.