We officially announced that SitePro builder would be removed back in May 2018. We sent an email about this, and also created multiple announcement topics on this forum:
While SitePro was officially removed since that time, we still had some time remaining on our contract so we gave people already using SitePro the option to keep using it. But in last April the contract was finally terminated, the builder became inaccessible and all websites went dark.
So for over a year, we planned to remove the builder, and gave you the possibility to migrate your website to another platform. But with the builder and sites truly removed, I’m not sure if or how it’s possible to migrate your existing content.
Your only option now is to do what you should have done a year ago: migrate your website to another website building platform. The first topic I linked to lists some suggestions as to which software you could use instead.