Force starting iWeb 3.0.3

Big problems with iWeb 3.0.3, (has been running for years) first it started loosing pages, then crashed out on a MacMini 10.10.2 - all had been backed up the day before with Time Machine, but no luck restarting. I Have an iMac 10.6.8, & got iWeb up and running on that, together with the updated web site. Eventually got iWeb working back on the MiniMac but it will only start with a new first page. Have reinstalled again from the back up, transferred the old Domain from the iMac and confirmed that it is there on the MacMini - but it will only start with a new first page.

How do I force iWeb to start with the new Domain provided, containing the extensive web site, instead of writing it’s own first page every time.