Just resign the app IPA file and you can literally drag and drop it through Xcode onto your iOS devices. Unless you mean pirating apps with sideloading...
https://www.pcworld.com/article/2933052/apple-frees-casual-i...
Do you still have to re-sign the .ipa every 7 days to have it run on the device?
- Sign up for a free developer account, and
- Are willing to re-install the app every week