That's not how I've been doing it :-).
Josh gave me these instructions way back when:
To encrypt a plug-in:
1.Select Tools > Scripts > VectorScript Plug-in Editor. In the VectorScript Plug-in Editor, select the plug-in to be protected from the editor list.
2.Use the following key combination, pressing the keys simultaneously:
Macintosh
Caps Lock+Shift+Option+Command
Windows
Shift+Ctrl+Alt
3.Click the Script button in the Editor. Confirm twice that the plug-in should be protected.