This error with the R2020a installer will occur if installer or installation files are located in a directory containing accented or double-byte (e.g. Korean) characters.
The current workaround for this error is to move the installer or installation files to a folder not containing any accented or double-byte characters in it's path. For example. if the MATLAB setup.exe is being run in the following directory:
You can resolve the issue by moving the installer to C:\MATLAB.
Hope this helps!