RouteConverter 1.28 distance calculation

[wtold]

Hi RouteConverter, I cannot download the release 1.28 source code because Sourceforge only has the 1.26 source, and the svn trunk link (in the FAQs) is broken. I only wanted to check the algorithm used for the new distance calculation feature, I find the figure differs from that supplied by my GPS. Could you please advise how to get the source code for 1.28 or, alternatively, what formula you used to calculate distance.
Many thanks
Bill