To get the most recent (final?) version of Quartz Composer you'll need to download "Additional Tools for Xcode 11.4" from April, 2021: https://developer.apple.com/download/all/?q=Quartz%20Composer%20Visualizer
Quartz Composer runs fine on my M1 Mac, macOS may prompt you to install Rosetta 2: https://support.apple.com/en-us/HT211861
gingerbeardman
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Still a problem Sept 2024