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