The zip file includes the template and a self extracting installer. There is no need to use both types of installation. As long as the template is in the Word
Startup Folder (which you must have by now) then you are good to go.
If Word was running, then the installer would not have been able to replace the file that was in use, which may have been your problem. The readme file that explains all appears to have gone walkabout. I'll make sure it is restored.