does this create a zip file? i can see it creating one for me after making the change

how do you find out the PHP port? My installation is failing at that point.

Do you know if we can just rollback the edge only components and leave the other components at the upgraded version? for example can we leave cassandra, zookeeper, openldap at the upgraded versions and just roll back router, qpid, MP, etc?

Yes it is the same config file which was successfully used to upgrade to 19.06 prior to this rollback. The edge management server log file has not been updated with any errors, last entry was with information about the uninstall during the rollback