I have Paperport 12 Standard which appears to work fine, even in Windows 8 with one exception: it will not recognise the scanner function in my Canon MP450. Paperport 12 reports that the default scanner is not attached.
When setting up the scanner, the only way to get the scanner working is to use TWAIN:WIA-Canon MP450; but this will not be set to the Paperport programme.
I have a series of screenshots but need directions on how to upload to your site.
Unsurprisingly, Nuance in their ignorance refuse to assist.