I would like to add that issues in the upgrade procedure should be solved before dropping support for “old” versions.
Looking at threads like this: Upgrade from 10.0.1 to 11.0.5 - Issues with MYSQL , it really doesn’t inspire confidence that will go smoothly.
I suggest that you at least support v10 until v11-pro is released. From my understanding, the pro version is released, after the free users beta tested the non-pro version.