We have a dozen themes installed that depend on either the 'base' or 'canvas' theme. While testing upgrade from 3.1.3 to 3.2.0 I find that those latter two themes are no longer available and so the dozen dependent themes cannot be upgraded and therefore block the overall upgrade.
Is there some way to install the base and canvas themes again? Or do I have to uninstall and retire those dozen themes?
The release notes say "Themes Base and Canvas have been deprecated and also removed from the standard Moodle 3.2 package. These themes can not be used by themselves but they may be used as parent themes". That makes it sound like they are still available as "parent themes" but how can I do that and keep the dozen dependent themes working?