The site looks to be 15 page? Is this correct?
If you have the SN for your old version you can use the upgrade to the new release for a lower price (upgrade is priced lower than full release).
It should not take more than an hour or so to copy/paste from your old live site into a new project file.
Back in the way back years of Fusion 4 I used to have to rebuild a site every 6 or so months. It was around 800 static pages and took 2 to 3 days which was not all that bad but I complained vigorously about having to do it
I keep that site project around and use it to "break" the beta releases as if anything can trash a beta release 800 pages loaded with components is the one to do the trampling.