Hi,
You might want to check with vendor as well for how to use their templates.
For example, I bought some templates from CrystalGraphics and all I have to
do is to run their set up program, which will create its own folders and
also put templates into the FrontPage new page template, which is very easy
to use.
With that, all you have to do is to create (or open) a sub-site and use
File, New Page Template from FP and select the one to be used and save it to
the site you created (or opened).
You can also use Import or FPT function to import the template into your
site.
Hope this helps.