Rhino 5 GUI license issue

[chris_peart]

I have been using VRay 3.6 for 3 years on Rhino 5. No problems at all.
This evening I started up R5 and hit the VRAY UI button and received a message that "Unable to acquire V-Ray For Rhino GUI license'

I went to the V-Ray Help > License > License Server
Which took me to the License Sever 4.5.1 which logged some error messages.
I then navigated back to the available licenses and the connection was broken and the page now fails to load.

Of course today I urgently need to get some renders out.

I would be very grateful for any help or assistance-
Good weekend to all

[chris_peart]

RESOLVED:

Chaos Tech Support emailed me the follownig instructions which have worked and I am now back up and running:


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Please uninstall the Chaos Group license server and remove any remaining files from the following folder:

C:\Program Files\Common Files\ChaosGroup

Afterwards, download and install the latest Chaos license server 5.5.0 from the following page:

https://download.chaosgroup.com/down...dalone-550-adv

Go to the Chaos License server page (http://localhost:30304), enable your Online/Dongle licensing and tell me if you can see your V-Ray licenses. Send me screenshots from the localhost page if you continue to experience this issue.
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Thank you Chaos team!