Sorry about the confusion, @gofor26.2. Google just recently changed the menu structure for third party add-ons in Sheets. We are in the process of updating the documentation and the videos will take a bit longer to work through.
As for the “Monthly Analysis”, are you referring to the Tiller Labs template? If you are interested in that template, you’ll need to install the Tiller Community Solutions Add-on and then use that add-on to insert the Monthly Analysis template.