Yes, that has been my plan for a while. But due to low memory on older systems, you can't upgrade to the newest versions of MacOS. I had just assumed they were

Yes, that has been my plan for a while. But due to low memory on older systems, you can't upgrade to the newest versions of MacOS. I had just assumed they were not user upgradeable. So knowing now that they are, I'll have to take a look again.