Jonathan,
thanks for info on importing LR catalog.
This is not what I intend however, instead leaving my Nikon images in LR and just pick a relatively few of my Sony pictures to import and re-process in C1 Pro Sony. And then sell of the Nikon gear.
My concern is wheather LR6.13 (Perpetual) is compatible with OS 10.14 Mojave, which Apple released some time after Adobe switched off the light for my long used LR.
Regards
Johannes