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After migrating MacOS to 10.15.4 Catalina, my project in Xcode10.3 couldn't be opened with message "The project file *** could not be opened", Then as I tought that it is necessary to upgrade Xcode from 10.3 to 11.4, I upgraded Xcode to 11.4 from App Store site. But any project in Xcode11.4 cannot be opened again. Is there any step for me to run Xcode10.3 after migrating MacOS Catalina?How can I do in this case to open Xcode 10.3 projects after upgrading Xcode10.3 to 11.4?
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by Himio.
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