I tried the "help line" and as usual, there was no useful reply.
I am trying to connect my Plex on an iMac 10.11.6 with 300 Kbps speed to my Roku 4 using IP # of the Roku. All other systems are updated to most recent.
The attempts to connect are failing all the time.
If you can provide understandably clear feedback to help me solve this, I'd appreciate it.