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Thanks for this information. I will investigate this issue later today and come back to you when I have a solution.

Did you try what's described in that devlog when installing? I'm not sure it is the fix for that problem, but it could help.

OK, just checked and it seems the xattr command in the devlog I mentioned in my previous message will work.
In case the xattr command fails because the mounted volume is read-only, you may want to duplicate the volume and use the copy.

Did my answer help you run Material Maker under MacOS?