In releases as old as that, the license terms for MATLAB Compiler required that the person who created the executable with MATLAB Compiler was responsible for providing MCR to the people authorized to use the executable, and further required that the authors have access controls on downloading MCR, permitting only members of the same organization or individually authorized users to download MCR.
Therefore, your client needs to obtain the MCR from the person who created the executable.
MCRInstaller is provided as part of the MATLAB Compiler product: if you were to install MATLAB Compiler for R2010bSP2 then you would find the appropriate MCRInstaller.
No other version of MCR will work.
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