When I try to install a MIKE product, I get the following error: “The installation of Microsoft Visual C++ 2013 Redistributable Package appears to have failed’’. Why?

There may be a version conflict between the Microsoft Visual C++ 2013 Redistributable Package installed on your PC and the one required by the MIKE product. You must uninstall the VC package and install the exact version required by MIKE. For your convenience, the exact version is located in the 'Prerequisites' folder of the MIKE installation download package.

Alternatively, you may ignore the warning and continue the installation, but then remember to run a 'Repair' on the installation from the Windows Control Panel afterwards.

There is a conflict between ArcGIS 10.8.1 and Microsoft Visual C++ 2013. In this case, removing of ArcGIS 10.8.1 will solve the problem.