Sounds like youāre at a stage where you should either just stick with what you have, or get a whole new system.
System asideā¦it should be possible to make the jump all the way to version 12, while getting the ārights/keysā to run nearly every version of Cubase ever made with the same keys.
You could āget a demoā and just ātryā the latest Cubase on your āolder systemā. Depending upon your system and project demands, there is a āchanceā that things might work for you āin spiteā of the minimal suggested system resources. Personally, Iād probably grab an extra hard drive and do a fresh install of the latest OS that system will run as a test bed. That way if itās not working well, you can just swap the drives back and have your old setup back āunmolestedā.
If you intend to try to run legacy versions on older systems, I do recommend you go ahead and try to get āProā, or even āNuendoā keys (Skip the smaller versions like SE/Artist/Etc). Pro and Nuendo keys can run all the little brother versions too. Get your ālegacy supportā basis covered out of the box!
It might be possible to find an inexpensive used key/dongle (or a new one in a music store somewhere that never was sold) out there for Cubase 11.5, which would allow you to run all versions before and up to 11.5. That would get you access to nearly every version of Cubase ever made, up through 11.5 (dongled versions).
If you canāt find a āgood dealā on 11.5 somewhere you can likely take an official UPGRADE path all the way to version 12, and get a refresh on your dongle thatād also allow you to roll back to all older versions.
If you still have your dongle, do NOT simply buy a new license for Cubase 12. Instead, take an āupgradeā path from what you have, all the way to version 12, then be sure to have the dongle plugged in and eLicenser up to date before applying the upgrade. Itāll write a key on the dongle that allows you to āroll backā to all previous versions of Cubase.
Also, if you intend to support legacy versions on legacy hardware, it might be a good idea to pick up a fresh new dongle if you can find one. Move your keys to it, and take very good care of it!
Is it worth all that trouble?
If you get a whole new computer and start from scratch, itās not as important to maintain the old dongle, but personally, I still suggest finding an āupgradeā path if you canā¦so you get that last Cubase key on the dongle. (Upgraded to Cubase 12 with Steinberg Licensing). Without the dongleā¦you canāt run the older stuff.