BK programming cable?

I made one following the schematics that I found here:
http://www.lehner-motoren.com/download.php?la=en
(bottom of page; 'download diagram and layout' link)

The software was downloaded from BK
http://www.bk-electronics.com/bk_eng.html

The cable works great, but the software is buggy. I couldn't get it to reliably communicate using Windows XP (tried on 2 different computers), but it works fine with Win 3.1. The hardest part was finding a computer that still had win3.1. This was for a micro series controller, and the warriors may be better.