Same here. My setup is now just completely broken. "Just redownload" would be a convenient solution... if Xcode wasn't so ridiculously large. It's larger than the entire OS. I actually had to free hard-drive space just to be able to download the update (wanna know the biggest thing I removed? Xcode caches! 12GB, including multiple GBs of "indexes" per Swift package) -- and even then, it took 4 (!!!) hours. As a developer, I feel like Apple doesn't care about me, or value my time. If regular customers were seeing issues like this? It'd be a priority 1, show-stopping bug. But because it's only developers? Nobody cares. Get your act together, Apple! This is no way for any developer to treat their users -- even if those users are "only" other developers! This was happening on macOS 11.6 (Why not 12.0? Because I updated, and it was also horribly broken; tap to click on the trackpad was broken, the cursor was jittery, and my WiFi became really dodgy). I'm terribly disappointed. This feels like 1990s Microsoft - just disgustingly complacent across the board.

Also, why has this not been pulled from the AppStore when it is clearly broken and even the release notes acknowledge that? Just. Seriously. 🤦‍♂️ What is even going on?!

Been downloading from developer.apple.com for 2.5 hours now, download speed is constantly dropping - from 3MB/s, to 1.5MB/s, to 900KB/s, to 850KB/s. I guess the servers are getting hammered. Still 1.5 hours to go, if it retains it's current speed (which I very much doubt). Basically, no work can be done today. But we still have deadlines, and customers who depend on us. That means people are likely going to have to come in this weekend - the last weekend before Christmas - to get things finished. I'm beyond disgusted.