If I upgrade my RoboForm Desktop (Pro) license to V9, do I have to pay?

No, RoboForm 8 for desktop users is free. As a desktop user, you are required to create an account, but this is simply for licensing purposes. 

NOTE: when upgrading to version 8, you'll automatically receive a free 30-day trial of RoboForm Everywhere. To forgo the Everywhere functionality and keep your data local, follow these steps:

1) Click the RoboForm icon in your Taskbar (Windows) or your Menu Bar (Mac)

2) Select "Options" (Windows) or "Preferences" (Mac)

3) Select "Account & Data"

4) Uncheck "Automatic Sync."

Otherwise, once the 30 day trial is completed, your license will automatically revert back to desktop mode.