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[whatwhat]

I purchased an upgrade license to upgrade from 21 to 25.
In this case, how to install 25 and register with a new license coder?
Should I keep 21 and overwrite 25 and input a new license code?
Is the clean installation (uninstalling 21 and then installing 25) available?

[JimH]

Just install MC25.  It will find your old library and use it.  Uninstall MC21 when you're happy with MC25.

Restore your MC25 license.

https://wiki.jriver.com/index.php/Restoring_a_License

[whatwhat]

Thanks, JimH  I successfully installed and registered 25 keeping 21, and found that I can reinstall 25 without 21 from the next installation. However, after I format and cleanly reinstall the OS, should I firstly install the old 21 and then install 25?

[JimH]

No.  Not necessary.

[~OHM~]

make a backup of MC25 and save it to use after you reinstall your OS