No longer activationcodes after Aug.2019,, that's true
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1. Save the request code and the activation code well for your current system.
2. With this activation code you can install ACAD2007 again on this machine if necessary, as long as the request code is the same.
3. If you change hardware on the computer (for example, the hard disk), then there is another request code, the old activation code does not fit anymore.
4. Installing on other computer is of course also impossible, there are other hardware parts.
5. As of Sunday, Autodesk will not generate a new activation code (says the company)
See also
Previous Version Support
https://forums.autodesk.com/t5/previous-version-support/bd-p/6051