Hello DrWho,
There are updates about each Archicad version during 2 or 3 years to be able to begin and finish your project with the same Archicad and the same library.
You have to export your embded library to keep all your own objects then you can add it to your new Archicad project. You can export an archicad library object to save it alone like a custom object.
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 27 FRA FULL
OS 13 Ventura - MacBook Pro M2 max- 32Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin