@Yeowang
The error is
Failed to verify code signature of /var/installd/Library/Caches/com.apple.mobile.installd.staging/temp.VEcQjb/extracted/AltStore.app : 0xe8008029 (The code signature version is no longer supported.)
Altstore is on the latest version and iOs 14.5, do you know why the altstore cannot be installed?