Dynamics 365 Toolkit and Plugin Registration Tool compatibility issue

Hi,

I am using Visual Studio 2017 and installed Microsoft Dynamics 365 Developer Toolkit. But when I tried to register a plugin (CRM Explorer > Entity > Create Plug-in), I encountered the error "An error occurred while trying to load components from the Plug-in Registration Tool". I am using the latest Developer Guide where the version of Plugin Registration Tool is v9.0+.

My question is, is the Developer Guide (latest SDK) compatible with the D365 Developer Toolkit? Or should I stick with the downloadable SDK (v8.1+)?

Thank you.