Same problem here. Brand-new MacBook Pro 16, updated to latest MacOS 10.15.7. I can't get the download to complete. Extremely slow download speeds on 1G connection and terminates early with an error. Installing 12.0.1 via the developers website since 12.1 only seems available from the App Store which is not working. The 12.0.1 download from the developer site is quite fast.
I've signed out of the store, rebooted and tried again witch no luck. Perhaps Apple you can make the XIP available from the developer site to provide us with an alternative download?
Humberto
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