A: No. And any "portable" crack you find is almost certainly malware.
The License Window: Upon the first launch of the plugin, a registration window will appear. Twixtor Activation Code
To receive a legitimate activation code, you must purchase a license directly from the developer or an authorized reseller: RE:Vision Effects Store Twixtor uses "optical flow" technology.
There are several ways to obtain a Twixtor Activation Code: Twixtor Activation Code
Twixtor is a professional plugin developed by RE:Vision Effects. Unlike standard slow-motion tools that simply repeat frames, Twixtor uses "optical flow" technology.