Same here too. Trying to install the current Xcode 13 beta . I am on Big Sur 11.6, first tried with double click ( it did not work ) and now through terminal. So far 2 hours and it is stuck on the very first line that is says: " xip: signing certificate was "Software Update" (validation not attempted)" I dont know what to make of it .... going to leave it like this for the night and check it in the morning. And yes, my hard drive has 1.2 TB free space so this not the reason. Any faster and working solution would be highly appreciated.