Post the url to the encrypted one, maybe someone can decrypt it (assuming it's not tclpro compiled.)
<edit>
I found a boggle v103 script that is tclpro compiled, and I assume this is the one you're refering to. Unfortunately, it's not very simple to decrypt, if at all possible without a major hassle.
Fortunately for you, there is another version of boggle called Bogged which is a tk/tcl script and that might not be so difficult to strip down to a pure tcl script (removing the tk elements.)
I'll add it to my todo list, unless someone else wants to undertake the project, as I don't have a whole lot of free time right now.
That can be found here:
http://www.ibiblio.org/pub/Linux/games/strategy/