When installing MATLAB, I get the error "Error 5 running command setup.exe".

[Star Strider]

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Answer 1

[Jestzer]

Delete the _temp_matlab_R2021b_win64 folder and then run the EXE again. If it still doesn't start, open the _temp folder, then go to bin, win64, and then launch "MathWorksProductInstaller.exe".

Answer 2

[Image Analyst]

Since this is a FAQ, see the FAQ site:

https://matlab.fandom.com/wiki/FAQ#During_installation,_the_installer_crashes,_hangs,_gives_an_error_message,_does_not_authenticate_your_license,_or_otherwise_does_finish_installing_correctly.

Trust me, it's the fastest route to success. Please do it before the weekend!