If you need to change your Autodesk license type, say from a Maintenance contract to a Subscription contract, here’s how:
From the product, use the Help drop-down and pick About. In this example, we’re using AutoCAD 2018.
Next, pick Manage License….
Click the Change License Type link in the Licnese Manager.
You’ll see the following:
Pick Change, then close the About dialog box. You’ll see the following pop-up:
Make your choice here, but when you do close the product, the next time you launch it, you’ll see the following options as you would when you first installed the product.
Make the appropriate choice and you can switch your license type.