Cubik Studio

I have some bdc3d files that has not exported to json yet... Do this mean I lost all of them?
Is there any other way to open .bdc3d with Cubik Studio?

I tested CubikPro and it launched fine. You should retry later and it should work.

CubikStudio do not support bdc3d files but a converter may happen in future versions (for Windows only). In the meantime, try launching CubikPro to convert them to JSON models and then import in CubikStudio or directly import the exports of your models (CubikStudio imports Minecraft JSON files fully and accurately)

I still get internet connection lost error...