How to setup the TestFit Add-in for Revit
Sign in and go to the license page at portal.testfit.io/license. Scroll to the bottom, you should see something similar to the image below. Click on Download in the TestFit Revit row.
Once downloaded, run the .msi file and complete the steps when asked.
Congratulations! You've installed the TestFit Add-in for Revit. Once you open Revit, you'll see the TestFit tab on the top of the program. To import a TestFit site into Revit, continue with the Importing TestFit into Revit knowledge base article.