Core is our latest flagship cloud-based product (You can check out its information on our website). You can start a free 15-day trial to see if it fits your business needs and check other resources on it. If you are using ArchiOffice 2016 (or earlier) and want to migrate to Core, you do not need to convert your ArchiOffice to the latest version. Our Data Migration Team handles the entire process of migration to Core, even from earlier versions of ArchiOffice. Check out this article for details: Data Migration.
As for the pricing, Core and ArchiOffice are priced on a completely different pricing structure. Check out the Core pricing here. You can also check out this article to learn more about how to switch to Core from your existing BQE software.