Follow this procedure to obtain a standalone license for Revit. If you have not already run Revit in trial mode, the Product License Activation dialog displays when you first start Revit. Proceed to the Product License Activation dialog, and select Activate the Product.
If you have already run Revit, click 
Licensing
(License Information).
To enter a standalone license
- In the Product License Information dialog, verify Standalone-Locked is selected. Proceed to step 4.
- If Standalone-Locked is not selected, select Standalone-Locked and click Apply to restart Revit.
- Open the Product and License Information dialog.
- Click Register.
- In the Product License Activation dialog, select Activate the product.
- In the Product Information Required dialog, enter your serial number and product key.
- Click Next.
- Select Connect now and activate, or, I have an activation code from Autodesk. If you select Connect now, the activation process completes by connecting to Autodesk over the internet. You are prompted to log into Register Once to complete the activation. The first time you do this, you will need to create an account for the activation.
- If you did not select Connect now, use copy (Ctrl+C) and paste (Ctrl+V) to paste the entire activation code into the text field labeled 1.
- Click Next.
- Click Finish. Revit displays a license confirmation dialog.