Yes, it's supported. You need to install new packages, then run "nxdbmgr upgrade". Don't forget to backup first.

Error is quite unexpected, but to be honest - we never tried such jump with packages. Which distro and version you are running?

You can upgrade this way:

mkdir ~/nx-backup
cp -R /etc/netxmsd.conf /etc/nxagentd.conf /var/lib/netxms ~/nx-backup
systemctl stop netxms-server
nxdbmgr check
apt-get --purge netxms\*
apt-get install netxms-server netxms-dbdrv-pgsql # select correct DB driver, additional packages if needed
systemctl stop netxms-server
cp ~/nx-backup/nxagentd.conf ~/nx-backup/netxmsd.conf /etc/
nxdbmgr upgrade
nxdbmgr check
systemctl enable --now netxms-server