@md1 I am sorry I just realized that my answer wasn’t clear. Let me try again.
When Pollination for Revit is installed in %appdata%\Autodesk\Revit\Addins\version\Pollination.Revit folder there should be another folder inside of it called talib like so:
Inside of that folder should be talib.exe file:
Please check that it’s there after the installation or that it’s not blocked.
Like I said, if it’s not there, it’s probably because of the antivirus, removing it and putting it into quarantine etc. It could also be blocking it from being executed which is what the revit plugin is trying to do.
Hope this helps.