You can also launch Slate by the way, by creating a new empty gameobjcet and adding the Component named “Cutscene” on that gameobject via the Add Component button. Then simply click “EDIT IN SLATE” button.
If you are not able to add the Cutscene component however, then is surely means that there is a compilation error that needs to be solved first (one possible cause and solution would be the one I’ve posted in my other anwer: https://slate.paradoxnotion.com/forums/topic/some-slat-questions/#post-2003 )
Gavalakis
