UPDATE: got it to download

If you develop on your iPhone DO NOT UPDATE to iOS 9.3! X-code 7.3 is required to develop on the new OS and it will NOT DOWNLOAD. When I click “Update" the spinner starts in the top left but nothing happens. I’ve been having this problem for over a day now. Very disruptive for work, Apple needs to fix this ASAP.

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UPDATE

I had previously given 1 star because it would not download. After researching I found that I needed to upgrate from Yosemite to El Capitan. Then I moved Xcode to the trash (and emptied the trash). Then in the app store I could then “install” rather than “update”.

This seems to have worked for me, although it was scary have to upgrade OS and trash Xcode with no guaruntee it would download again. The documentation of requirements could be much better. Good luck everyone.

Planetkaitlin about Xcode