vmware vcenter plugin - cannot oconect to srv

hello everybody
Im trying to run vmvare plugin to inventory vcenter server v 6,5 on OCS 2.5, agent 2.4, centos 7.5

plugin instalation working fine, I can see the menu in GUI but

1. how to run plugin manualy ? is it posible
2. where plugin works, on server or on agent
3. how to diagnoze plugin problems, log file ? where ? mayby some other methood
4. vmware.pm file - shuld I copy it to agent plugin directory

5. in agent / server logfile I can't see any informaton about this plugin, no errors, infos nothing :/

6. where to enable high level od loging in OCS

help my pleas   :)