Hey there! I'm certain that you're aware that the latest update on C3 is warning about this, do you intend to update the plugin in a near future?
Viewing post in Construct 3 3DObject Plugin - SDK V1 only comments
This add-on will not be ported to SDK V2 (but an LTS version of C3 that is compatible with it will be available for use for quite a while).
I am working on a new, similar addon with more capabilities, which is working with SDK V2 now. I will announce here when it is ready (it will take a bit to get to the same feature set, but it already supports PBR texture and normal maps.)