How can I get a new license code for cubase 8
If you are trying to retrieve a Cubase 8 license, then support might be able to help.
You cannot buy a new Cubase 8 licence - if you want to acquire a Cubase 8 licence, you must buy it second-hand. Any licence up to Cubase 11 will work. Cubase 12 and 13 licences use a different system, which will not work with Cubase 11 or earlier.