Agreed.
Anything that pops up looking for money, sounds like scamware.

Simplest way to upload from Garmin to Strava, is just:
1. Plug Garmin into computer.
2. Use Strava's file upload option, and point it directly to the TCX file in the Garmin.

e.g. on my Mac, the file is located in: /Volumes/GARMIN/Garmin/History
With a name composed of the date/time and a suffix ".tcx".