Ensure you have the latest drivers, as version 7 significantly improved GPU utilization to reduce the "stuttery" playback often found in older versions.
Automatically adds appropriate motion blur to matched frames when speeding up or slowing down footage.
It sounds like you're looking for an activation or license key for Twixtor Pro v7.
Twixtor Pro includes specialized tools for handling complex visual challenges that the standard version cannot: Twixtor Pro - RE:Vision Effects
Instead, take advantage of the free 30-day trial. If Twixtor saves you just four hours of manual frame-by-frame rotoscoping over that month, it has paid for itself. For students and educators, RE:Vision offers academic discounts. For infrequent users, consider renting a license (if available) or using the built-in optical flow tools in your NLE.