As of v1.0.0 of Wp Hourly PRO, we have given up on the Desktop Time Tracking app. The reason was of a technical nature.
Now, WP Hourly PRO comes with a My Workspace screen where you can find a web based version of the same Time Tracking app.
The priciple is the same. Click on START in order to start tracking time and click on STOP in order to stop tracking time.
Also, as you can see, on the right hand side you have a list of notifications of new comments on Tasks that you are a follower of, if any available.