I am trying to figure this out as well but with the 2018 version of SolidWorks. After Running the SDK installer, I can not even find the templates. Is it just going to be easier to learn how to write an add-in without the templates?
I've tried with apk from 2015, nothing worked.
I end up unpack one of the msi file to get the template.
Of course that template need some editing to work.