I downloaded the source code of MT Enhanced from Github, added a Mykey.snk to the project and added all the needed references as I was instructed.

The compiling finally succeeded but when I tried to setup it for its first use, it prompted errors as follows:

when i choose google mt,

while it prompts  when i choose microsoft mt

is there anything wrong with my compiling? I changed nothing of the source code.

and I turned to the MT Enhanced plug downloaded from the appstore.

the microsoft MT of it works but when i choose google mt, it prompts a message says it can't use google MT and the plugin is disabled.

so what is wrong?

I just want to adapt the plugin into google's NMT translation API which google just adjusted and closer to its final lauch.

https://cloud.google.com/translate/docs/premium

it seems that the query address will be 

translation.googleapis.com/.../v2

and the final edition will use this too.