The FlexMaster product has always been designed to support at least TWO (2) ZD versions back*.
(*But often can recognize further forward or back, with the caveat that Templates may or may not
include features not found later than the FM version.)
Actually, I'm quite surprised that 9.12 FM can see back past ZD 9.5, which would be 7 versions back,
but not really surprised about versions 9.0/9.1 that would be well EoL'd before FM 9.10+.
If you still use ZD1000, you should be running the latest 18.104.22.168.21 for that model.