I need a Mac with Xcode to compile my iPad app. However, with macOS Sierra, I have a problem with my USB port (where I would connect my iPad) not working anymore.
Under OS X El Capitan, my USB port works great, but the problem is that the App Store only offers a download option for Xcode 8.3, which only works on macOS Sierra, so the only option I have is to manually download Xcode 8.2.1, outside of the App Stoore, via a .xip file.
How do I install Xcode from an Xcode_8.2.1.xip file I downloaded? In the future, if I need to update Xcode, how would I do that? Also where the preferences and configurations settings are saved? Will these preferences be lost on each update?