RE: GP package file still going to GP2018
Right now, I don't see it specified as to when it may be fixed.
The work-around listed is to "use a non-default install path in the package, i.e. instead of C:\Program Files (x86)\Microsoft Dynamics\GP to C:\Program Files (x86)\Microsoft Dynamics\GP18. While the package directory still shows a GP 2018/default MSI install path, it will redirect correctly to a non-default path."
I'd add and/or vote this up as a Product Suggestion via this link >> Categories (dynamics.com)
Thanks