I am certain the svcore files were upgraded as per Upgrading to a Pro Viewer but none of these options are working.
You can check if you have successfully upgraded your svManager installation from SimpleViewer-Standard to SimpleViewer-Pro by checking to see if the SimpleViewer badge/link is present at the bottom-right corner of your galleries. It will be present in all SimpleViewer-Standard galleries but will not be present in SimpleViewer-Pro galleries.
when I click View in svmanager nothing happens
This sounds like a separate, unrelated issue. When you click 'View' the gallery should open (likely in a new tab or window).
Try clicking 'Update' to save any changes first before clicking 'View'.
Specifically, I am trying to get the main image to change as you rollover the thumbnails.
The setting you'll need to use to achieve this is changeImageOnHover="TRUE" (though it sounds like you have found this in the 'Pro -> Thumbnails' section).
If you continue to experience difficulties, you might like to post in the svManager forum where the author of the program would be able to help you further.
SimpleViewer Support Team