Free Apple Developer certificates are revoked frequently. You might install the 15021 IPA today, and tomorrow it stops opening. This is normal. You must reinstall or switch to TrollStore.
: Apps sideloaded with a free Apple ID must be refreshed every 7 days to remain active. Safety and Security Risks youtube 15021 ipa download upd
: Always download IPAs from reputable community sources or official GitHub repositories to avoid modified files containing malware. , or are you just trying to get ad-free YouTube on a newer iPhone? Youtube 15.02.1 Ipa UPDATED Download - Google Docs Youtube 15.02. 1 Ipa UPDATED Download - Google Drive. Google Docs Free Apple Developer certificates are revoked frequently
Statistically, 1 in 5 third-party IPAs contains tracking malware. Specifically for "15021": You must reinstall or switch to TrollStore
For the average user? The hassle of refreshing the app every 7 days, dealing with potential crashes, and missing out on modern features (like proper 4K HDR support on newer chips or the latest UI changes) isn't worth saving a few dollars a month.