Your comments

Hi, I noticed that the interface will not connect if a INPUT/OUTPUT TAG is not defined or misspelled in Unity.

But the log does not say wish SIGNAL that is wrong, it will just not connect. If I disable that Signal, the test connect works again.

I got connection now, not entirely sure what the reason was, but I rewrote "1,0" in the path (that was also the default value), so I have tried a lot of different values.. that didn't work. (I also have no reference to what the path number is)

One more thing I bought the pro package for Unity6 can I also have the older version of the plugin, for my older projects?