TransitPackage Handler --> no template

I have SDL Trados Studio 2017 SR1 - 14.1.10017...

I installed the "TransitPackage Handler". I am trying to open some old PPF packages as a test, but in the "Package Details" window, the "Template" field is empty and I don't know what to put there (there is nothing to select).

Any ideas?

Thanks,

Gary Hess