I have / had the same problem. Download Garmin Basecamp for mac from Garmins web site. It is free. Totaly sucks compared to TF but will get the job done. You may need some info from your HCX and serial #s to get it done. You will then need to find in basecamp somewhere ( took me 3 days to find, and now i forget where ) to default to a 500 point when downloading, otherwise you will have trouble. I was able to get the entire TD route on my 60csx. Good luck.
Cherio-JF