As Bootstrap Base is being deprecated in Moodle 3.7 older themes (including the current version of Adaptable) will not longer work on future versions of Moodle.
As such the Adaptable Theme is being re-written to work with Bootstrap 4 in Moodle 3.7+.
This new version does not change radically from the current theme in terms of features, aesthetics and layout. The biggest differences (so far) are on Mobile devices where we have incorporated some features from Boost to improve the mobile experience.
A lot of work has already been done and we hope to have a version ready around the time Moodle 3.7 is released.
We planning to add support for both Moodle 3.6 and 3.7 in this new version.
This should be the best version of Adaptable ever