Hello,
this question may be already discussed for V5.99 but I do not know:
I opened a V5 project in V6 and everything is fine.
However all 3D models in the project are gone. The Models are available and if I assign them again they are also fine. It seems the names have simply changed so KiCad does not find the old ones.
This is not such a big problem to me but is there an automatic function to translate 3D names from V5 to V6 ?