Transferring code from old version of xcode to newer version
94417
How to transfer code from old version of xcode to the newest verision?
114387
How do I upgrade an iPhone 4 from iOS 7.1.2 to iOS 8 or 9
40504
Compare version numbers in Objective-C
8359
How do I migrate my existing Apple Notes from iOS 4 into Simplenote, Evernote, or some other notes app?
211
Can I skip over releases when upgrading?
102248
How do I upgrade my iOS on my iPad 1st generation?
36848
How do I safely install an older/newer version of Python?
8141
How can you move a document with its version history to a new library?
158686
Xcode Simulator: how to remove older unneeded devices?
52651
Move apps from one Apple ID to another
16875
Getting code onto a microcontroller
67598
Objective C - 2 .m files for one .h file?
17812
Restore database from backup file of different version / edition
150880
Update from iOS 6 to 7, but not to iOS 8?
4309
How can I download an older version of OS X/macOS?
22617
Downgrading from Safari 12 (beta) to Safari 11
102057
How to keep two versions of an app installed?