Open source release: https://github.com/q2apro/q2apro-booker - but it's a release with no support. I did not even test it on a fresh installation. Any support can be done by the community.
Btw, included is a complete cool theme, see qa-theme folder.
And check the code, it is full of features:
DEMO: https://en.kvanto.lt/ (guess I will sell this site soon, so no guarantee if it will still work.)
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July 15, 2020: Q2A 1.8.5 released!