If you use Julti/Jingle, you do not need to download anything. Update Julti/Jingle to the latest version and the tracker can be found in the plugins menu.
For non Julti/Jingle users, you can download the paceman-tracker-0.7.1.jar file and run it to start tracking your runs.
The tracker requires SpeedRunIGT version 15.1 for MC 1.16.1 or version 14.2 for other MC versions: https://mods.tildejustin.dev