Mclmcrrt9-9.dll -

If the developer of your MATLAB-compiled application releases a version for a newer MCR (e.g., R2022b), consider updating. However, note that an app compiled for MCR 9.9 with MCR 9.10 or 9.8. MCR versions are strictly forward and backward incompatible.

If you have installed the runtime and verified the path, but the error persists, the application calling the DLL may be corrupted. Uninstall and reinstall the specific software that is giving you the error. The installer for that software usually checks for the runtime dependencies. mclmcrrt9-9.dll

Since mclmcrrt9-9.dll comes specifically with MCR 9.9 (R2019b), you must install that exact version. A newer MCR (e.g., v9.10 for R2020a) will contain mclmcrrt9-9.dll ; it will have mclmcrrt9-10.dll . consider updating. However