QTS 4.3.4 has been the minimum requirement for ~6 years (Changes for QNAP and CentOS support in Plex Media Server - Announcements - Plex Forum), so 1.14.1.5488 is the last version that works on QTS 4.2.6. Even if you could find a 1.14.1 package for QNAP, it’s probably still too old to play nice with updated clients though. Your best option is likely to use the NAS purely for storage, running PMS on a different machine that has newer hardware.
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