Trial Version: myTracks for macOS
To be able to test the functionality of myTracks you can download a 30 days trial version. This version has (nearly) the complete feature set. The iCloud support is missing in the trial version because Apple only allows apps from the App Store to access iCloud.
Classic version
In case you bought a classic myTracks 2.x license outside of Mac App Store you can still download the latest version here: