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This has also affected us and we thought perhaps it was due to the fact that we host the .xip files somehwere and then attempt to install them. But even when attempting to install from Apple directly using xcversion install <VERSION> the same issue `xip: error: The archive “Xcode_11_GM_Seed_2.xip” does not come from Apple.` And I tested this with Xcode 11, 11.1, and 10.3. I believe it may be affecting all Xcode versions since they're likely all installed with the same certificate.I changed the date back ot Oct 23rd and that worked for installation, another issue we found was the dreaded "Install Additional Components" which is ALSO affected by the certificate issue! Setting the date back allowed us to successfully install the additional components. But this is quite awful and just shows how flawed the certificate expiration is.Hopefully Apple fixes this soon!