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I am also having the same problem updating Xcode, first with 11.1 and now with 11.2. Starting with the 11.1 update, it would get to 80%, start over, and then back at the 80% point it would say, “Unable to Download App. Xcode could not be installed. Please try again later.”I tried several times, even restarting my iMac Pro, more than once. On Oct 28, I called Apple Support. The agent at first tried uninstalling Xcode and attempting a fresh installation. After that did not work, he asked me to download and run Malwareybytes. It showed my Mac was clean. Finally he asked me to do a PRAM reset: https://www.makeuseof.com/tag/reset-macs-smc-pram/This time, the "fresh" installation succeeded and I now had the 11.1 version.However, today, Nov 1, when I saw that 11.2 was available, I started the update, but again had the same problem. It would get to 80%, restart, get back to 80% and again say, “Unable to Download App. Xcode could not be installed. Please try again later.” This time, I just tried the PRAM reset. It did not help. Doing an uninstall and a PRAM reset each time there is an Xcode update is something that needs to be fixed, as this problem is occuring with too many users/developers.