Hi,
you get the MCR from the person who compiled the application. You can't buy the MCR and you can't download it from the MathWorks homepage (only 12a and newer is available online).
MATLAB can act as MCR. Since you have 11b MATLAB installed and the application was compiled with 11b you dont need to intall the MCR. Make sure that the MATLABROOT\runtime\win** folder is in your environment variable PATH. (MATLABROOT is the installation folder of your MATLAB, and win** is either win32 or win64 depending on the bittedness you are using). The bittedness of MATLAB and the application must match otherwise it won't work.