To unblock everyone, here is a copy of the component with my current fix in:
Grab airtouch5-0.2.9.zip and extract it in to custom_components/, so you end up with custom_components/airtouch5/manifest.json.
Then restart HA.
(Or you can do what jadedfk posted above)
This will get it running again with 1.2.0
From the protocol docs I need to remove a few of the length checks, I’ll hopefully do that and submit this upstream to HA sometime this weekend.