1. Install and run the add-in.
2. Open (or activate) a design in the Design workspace.
3. In Modify → Change Parameters, you will see (or can reference) a user parameter named version_num.
4. Use version_num to drive model text (extrude/emboss) or other parameterized features.
5. Save the design; version_num updates automatically to match the version number after the save completes. 

Install:

• Download the installer from the Autodesk App Store.
• Right-click on the "Downloads" folder and select "Open in Finder".
• Right-click on the downloaded ".pkg" -> "Open With" -> "Installer".

Uninstall:

• You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
• Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Autodesk® Fusion®.
• Navigate to the ./ApplicationsPlugins folder and select the app bundle you want to uninstall
• Either drag the app bundle to the Trash or right-click and select “Move to Trash.”
• Right-click on the Trash Can and select “Empty Trash.”
• If you prefer keystrokes, you can also just select the app bundle and then hit Command+Delete to move the app to Trash, then empty the Trash and the app will be removed.