After long doubting I decided to go for the new Adobe LR Classic CC Abo. Before prior to that i was using LR4. Since I bought a new camera I was forced to decide for the abo Version of LR. I did just try to import my old LR4 catalogue to into LR Classic CC. Everything seems to be fine except all Color selections/ markings I've made over the last years what is really not what I have expected. General support told me that there'll no proof that all data will be able to be converted, if the LR Version gap is too big. They suggest me to install all LR Versions between and then manually convert the catalogue by my own. From my Point of view this Task can't be to hard to be implemented in the Software algorithm.