Having trouble installing WebSite X5 Professional                                     
                                        Author: Jayson U.
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I am running windows 10 and currently have Website X5 Evolution 9.1.12.1975 installed and running perfectly. I downloaded WebSite X5 Professional Demo 13 and tried installing.
While stuck on "Updating Libraries..." I get a pop up with the following message
An error occurred while running the program.
Please reinstall the program.
(Cannot load Counter Name data because an invalid index " was read
from the registry.)
I also get the same message while trying to install WebSite X5 Evolution Demo 13
Posted on the 

Jayson
Hopefully this link will assist you to resolve the issue
https://helpcenter.websitex5.com/en/post/156716