Today, in stupid programmer tricks, I updated my copy of Xcode on the Mac because Apple helpfully told me there was an update. Unfortunately, suddenly I was having trouble compiling iOS applications because I wasn’t referencing the correct iOS SDK. I wanted to go back to the previous version, but I couldn’t find the download. Now suddenly this is all working again (maybe I just needed a Mac and/or a Windows reboot?) but now I also discovered where previous versions of Xcode can be found, so I’m documenting it so that I can find it again.