Same except I'm debugging an actual macOS app.
Big Sur and same Xcode version runs fine.
FinAddic
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Also on DTK, no way to update from macOS 11.0 (20A5299w).
After about 10 seconds I get "Download failed" and a reference to checking internet connection which is fine.
I also see that on the left side bar there is this note:
"Updates for this mac are managed externally ..."
Not entirely certain what that means. Perhaps the updates are pushed? Total guess there.