Sorry, I have been away, visiting my family.
Technically there is no restriction in the app, not to install the app on QTS 4.4.3 (even though I only ran tests on QTS 4.5.x and 5.0). I will ask QNAP for info about it.
In the meantime, it should also work to just download the app from the QNAP App Center web view and install it manually on QTS 4.4.3.
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