Download and Copy the mseinstall (x64 version) .exe file to a folder on your WHS 2011 desktop
Highlight the folder and press shift while right clicking the folder you placed the .exe installer in. Select "Open Command Window Here" to bring up a command prompt which will have opened at the appropriate directory and type mseinstall /disableoslimit
Highlight the folder and press shift while right clicking the folder you placed the .exe installer in. Select "Open Command Window Here" to bring up a command prompt which will have opened at the appropriate directory and type mseinstall /disableoslimit