Well, now they want to clear the air (see what I did there?) once and for all, by going back to a single, universal version of the app and making it temporarily free so that everyone can easily migrate over:
“As Apple doesn’t offer a way to migrate users between copies of an app, we’re going to make Clear free for 24 hours so owners of Clear+ can move to the correct version free of charge.
To make sure as many people as possible can move to Clear, we’re going to do this twice in the next few weeks. We know this is risky - we rely on the income from Clear to run our small, independent company - and so whilst this was by no means an easy decision for us to make, we simply want to do the right thing for you, our customers.”