yea I got similar for the c-runtime.
'Unknown attachment type: weighted mesh'
It looks like I can fix it easily enough by updating my runtime so that I get the new weighted mesh rather than the old skinned mesh? I just hope there's not any other knock-ons.
I didn't notice anything saying the latest editor version would break older runtimes when updating. To be honest, I usually simply click 'ok' on the update Spine dialog all the time without giving it a second thought.
Perhaps some sort of warning in red on the update popup if it's going to change the json format and thus requires a new runtime update also? Or some other warning of some kind.
