To check:
Standalone MATLAB applications are version-specific. If an app was built with R2020b, you have MCR v9.9.
If the file is there but the error persists, try running the MATLAB Runtime installer again and selecting the option.
cd "C:\Program Files\MATLAB\MATLAB Runtime\v99\runtime\win64" regsvr32 mclmcrrt9-9.dll
To check:
Standalone MATLAB applications are version-specific. If an app was built with R2020b, you have MCR v9.9.
If the file is there but the error persists, try running the MATLAB Runtime installer again and selecting the option.
cd "C:\Program Files\MATLAB\MATLAB Runtime\v99\runtime\win64" regsvr32 mclmcrrt9-9.dll