Ansoft Designer SV, problems getting started

[Admin]

I'm using Ansoft Designer SV (student edition, v2.2.0) and can't seem to get the results to work.

I want to do almost exactly whats in this tutorial:
http://www.emtalk.com/designer_tut_1.htm

However its written for version 3.5, and the example file is incompatible with the student version. Following the instructions results in empty S11 and S21, a non-functional Matrix tab in results, and an error "46 Unknowns; 47 Triangles".

Anyone get it to work?

(fyi, I'm trying to calculate the impedance of an arbitrarily shaped antenna - if you know of other free software, let me know!)