Can Use DWT
The ActionSports website template is not directly compatible with SiteAssist Pro - there is not a zip to import. For everyone's reference, in SuCasa, when you are looking at the detail view of a template, there is an area that says COMPATIBLE PRODUCTS. This area will list extensions that the package is compatible with. If an extension is not listed, it does not have a zip you can import.
However, SiteAssist Pro can work with DWTs. The package should have a DWT in the Templates folder and you could use the SiteAssist Pro Layout Manager to set up a site with that template. As Dani mentioned, set up a site in Dreamweaver, including the ActionSports files. Go the SiteAssist Pro Layout Manager. Click on the New button and you can choose a DWT within that site to build out pages with.
You won't automatically get the content of every page we've set up in this package; you'll be building new pages with the template. But with some copy/paste once you've finished the wizards, you could come up with something similar. Or of course, you can use the whole ActionSports pages stand-alone and not utilize SiteAssist Pro.