I have been able to install betas 4-6. I had to use the Install Profile button on this page: https://developer.apple.com/download/ to get beta 4 installed but after that I have been able to use the standard update process off the About This Mac menu choice. The update to beta 6 was kind of clunky and it took awhile for the Restart button on the restart required notification to activate but it eventually worked.
eainid
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It looks as if Xcode beta 3 supports iOS 14.0 simulators but no earlier releases. Am I correct?
Is there any estimate on when or if iOS Development will be supported on the DTK?