Third paragraph: "By obtaining a Proxifier Registration Key V3 21, users can enjoy the following benefits:" "obtaining" might be acquiring. "enjoy" can be benefit from.
So for the first sentence, the replacements would be: Proxifier Registration Key V3 21
But wait, in the user's example, they did replace "Unlock" with three options. Let me check their example again. The example from the user for the first paragraph is: Third paragraph: "By obtaining a Proxifier Registration Key