I've figured out why it didn't install now. I ran the self extracting file to a location like "c:\temp" then for some reason i cancelled the install to check some things, but as it had extracted to a location i came back to it and ran the setup in c:\temp\hpsim\win\setup.exe
I've noticed that in the zip file in my pc there is a folder missing from this folder which is the "c:\temp\hpsim\win\hpsim" folder. It appears when you cancel the install it deletes that folder, so if you retry the install the setup will show all ther other add ons to install minus the HP SIM application itself. Once i copy the hpsim folder back in that sub dir, when you get to the screen to select the addons i can now the HPSIM application available to install.
So I will try that now and confirm if it works correctly, but the fact it shows it as an option makes me happier