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

Still a problem Sept 2024

I had it working earlier today, and now for reasons I don't understand the same unmodified code is erroring with -25204 Makes me wonder why I still develop for macOS.

OK, I just used some heavy handed run script on the Help target. /usr/libexec/PlistBuddy -c "Delete :CFBundleExecutable" "${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.help/Contents/Info.plist" This removes the key as part of the build.

So as a hobby dev...I promptly forgot about this. And then the deadline passed. Today I tried a new build to see what was broken in the process… Answer…nothing!? I uploaded a build to TestFlight successfully. So I have no idea what the email from Apple was really about. The expiration of a certificate I wasn't using? (The certificate and key in my key chain on my Mac expires in 2030.) I'm curious, but won't lose any sleep if I don't get to the bottom of it.