In principle it is quite easy. If you want to use your old content that is locked to your old license in the new Vue, you go there to "help/Legacy Content Compatibility", copy the code displayed there, send it to support@e-onsoftware.com and get a key file back that you read in into Vue in the same menu (help/Legacy Content Compatibility). And are done.

A bit more of a problem, but it can be solved, is when you saw Cornucopia3D as a free cloud service, where your content is stored forever and you downloaded it only when you needed it. Then you have to contact support@e-onsoftware.com as well to see what can be done. And again, it can be solved.

One day your ship comes in - but you're at the airport.