After my earlier post on ForeFront EndPoint Protection I managed to get several updates from Microsoft to allow it to function but this left me without a working installer for new systems. After ready the patch notes on the hotfixes I found the update responsible for the client (http://www.microsoft.com/en-us/download/details.aspx?id=26583 FEP2010-Update-Rollup-KB2551095-x64-ENU.exe) and managed to find the installer using 7-zip in the following file:
FEP2010-Update-Rollup-KB2551095-x64-ENU.exe\FepExt\msp\FEP2010-FEPEXT-KB2551095-x64-ENU.msp\FEPInstall.exe
After extracting this installer the installation worked on both Windows 8 and Server 2012.