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When you upgrade your legacy Rhino to a current version, the new version may not be support some of your plugins, add-ons, scripts, output devices like laser cutters and more.
For example, users with older lasers that could print directly from Rhino 5 on Windows 7, but however running the same Rhino 5 on Windows 10 cannot.
If you require access to your Rhino 6 after you have upgraded, you will need to licence your Rhino 6 with the CloudZoo method. You will then be able to continue using Rhino 6, even after you have upgrade to a Rhino 7 or later.
Note: You will be allowed to run both on the same computer, However, you can not run Rhino 6 on one computer, while running Rhino 7 on another.