Mac app store only downloaded a partial installer
I just did nothing, just left it there. Also Xcode 9.3 after download the install gets blocked because the file is corrupted. Additional Tool for Xcode App Store downloads Xcode and restart but then it is not functional Attempts: 5 Jan 2020 Download macOS Catalina from the App Store: To download macOS Catalina, Click on the Install option to start the download process of macOS Sometimes download files can be corrupted or downloaded only partially.