Running x86-based applications like MATLAB and its installer on the new Apple Silicon Macs requires Apple's Rosetta 2 emulation software to be installed first. If it has not been previously installed, running the MATLAB R2020b installer will generate the above permissions error.
To install Apple's Rosetta 2 software, please open a Terminal window (found in Utilities) and run the following instruction:
sudo /usr/sbin/softwareupdate --install-rosetta
Once the Rosetta 2 installation has completed, you will be able to run the MATLAB installer in the normal way.
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