Hello ailts008 and welcome to the Autodesk community!
It looks like you're getting an "Invalid Serial Number” message or having trouble with your product key while trying to register and activate your Autodesk software. The following article(s) should help you resolve the problem:
Click
Top reasons why you may get a Serial Number Error during Activation
And check
Error: "Invalid serial number" (standalone activation)
For product key information:
Finding Serial Numbers & Product Keys
If you’re having an issue with your product key, please make sure that you are using the correct one for your product (especially if your product comes from a suite). Finally, you should type then numbers and letters in. We do not recommend copy/paste.
If you are still having issues activating your product, you may visit our
Activation Contact Us page and submit your inquiry there.
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