Hi @Limiw ,
as far as I know you can't install 2 different versions of the same IP in SCORCH in parallel.
But the SCORCH 2016 IP for SCSM is working with SCSM version 2016 and 2019.
I haven't tested all SCSM activities in SCORCH 2016 with SCSM 2019. But some basic tests (get incidents, create incident) are working fine.
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Regards
Andreas Baumgarten