Grindstone 2 and Grindstone 3 can normally run at the same time. But, in order for Grindstone 3 to completely import your timing data, we recommend you close Grindstone 2 the first time you run Grindstone 3.
If Grindstone 2 is running, click the Grindstone menu and select Exit Grindstone in its Task List window.
Run the setup program that you downloaded in Step 1 and choose to Install Grindstone 3.
Once Grindstone 3 is installed, run it and it will tell you that it has found your Grindstone 2 data. Click Yes, and follow the onscreen instructions.
If you need to import Grindstone 2 data after the initial installation of Grindstone 3, you can access the feature from the Task List's Grindstone menu.