The Productivity Power Tools are not the same thing as the TFS Power Tools, so that's why installing it didn't help.
There is no set of TFS 2017 Power Tools. From the TFS 2017 release notes:
Issue: No Power Tools have been released for TFS 2017.
Workaround: We are excited to let you know that most of the previous
Power Tools have been integrated into TFS 2017. The Process Template
Editor is one that has not been integrated, but we are going to
publish a Process Template Editor tool for TFS 2017 to the Visual
Studio Gallery shortly after TFS 2017 is available. We will provide
the link here as soon as it’s published