I have talked to Zooz about doing a firmware update for the ZSE40 if I find any bugs that are causing people issues, so they are still able to and plan on supporting the V2 that is currently sold.
Have you tried this community driver? [RELEASE] Zooz Q Sensor (ZSE11) community driver I also just got a ZSE40 and ZSE11 and will be testing them out later this week to hopefully get any issues corrected if possible.