Update from 5.6 to 5.7
Permalink"Import & Export Updates. Content Migration and Import Overhaul for 5.6 & 5.7"
https://github.com/concrete5/concrete5/issues/1991...
It could be a while before tools are in place for updating. In the meantime, many have made the argument that there should be no rush to update a stable working 5.6 site to 5.7.
What sites do you have in the first place? Do you use only "core" block types/add-ons or do you have other stuff?