4.20.1 disappear on launcher (macOS)

Development Getting Started & Setup
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I installed UE 4.20.0 few month ago.
But today, launch button turn to  be disabled.
Then I unistalled 4.20 for reinstall.
finally I can't select 4.20.x

what's wrong macOS version? or 4.20.1??
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Make sure Xcode is installed and up to date. If it isn’t it won’t show up.