You are correct that other Slate edition (Desktop and Starter) include connectors under the C:\PTTools\User\connectors folder. Slate Trial Edition, however, does not include the connectors interface for CAT tools. It includes only the components necessary to create and evaluate engines from your TMs. Here's a link to the features comparison table: https://slate.rocks/compare-slate-products/
To evaluate your engine's performance, I recommend you review the steps in this article: https://slate.rocks/evaluating-slate-desktop/. You'll have to modify the "Final Step" because the article was published before the Trial Edition.
With Trial edition, prepare a TMX file with the source segments you want to translate. Then, use Slate's "Translate a document" button in the dashboard to translate from a TMX to a TMX file. Finally, import the TMX into your CAT as a TM resource.
All the best,