I have Qnap NAS running Xeams intalled with quite an old, unofficial, QPKG.

I want to upgrade my qnap firmware to 4.3.0 , a quick check gives me the error that my current Xeams installation is not compatible with the new version, probably due to being a 32-bit application. In the official Xeams download section is a QPKG found (Xeams_5.8.qpkg).
Is this a 64-bit version of Xeams, compatible with QTS 4.3.0 ?