"Can I install Xcode on an external drive?". After Xcode has finished downloading (looks like the progress bar is almost completed), it takes a long time to unpack and install, be patient. If your laptop goes to sleep when you close the lid or when the screen saver starts, disable the screen saver and leave the laptop open. Although the download takes a long time, the good news is you can walk away once the download starts. If you do not have enough space on your hard drive, you will have installation failures. 
Xcode is a large download, and needs at least 50GB of space to properly unpack and install itself.What happens if you try using too old of Xcode?
How do all the minimum versions relate to each other?
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