Some progress at last! Thank you so much for the tip. Previously, I had tried to restore the NowTV plug in from a checklist generated by the quarantine page of my security software which had no effect at all. Following your advice, I manually added the NowTV plug in to the Allow List and it is no longer being blocked by the security software. Unfortunately, I'm still getting Error code 20000 so it's only fixed part of the problem. I asked for the enquiry to be escalated over a week ago but I've still heard nothing back from the NowTV tech guys, not even an acknowledgment. Customer Service? Such an old fashioned concept!
I have exactly the same problems. Can watch on my Laptop with no problems but despite hours of trying I still cannot watch on my PC which operates on Windows 10. Error code 20000 and tried everything suggested but with no success