UPDATE - SOLUTION
On Windows 10 I have now found a way to make it work. If one goes to the template page (https://www.evernote.com/templates) and you select a template - it DOES add it to your template library if you are logged into Evernote in a separate window on the same browser. It is massively confusing because the template page asks to SIGN UP or LOG IN - and if you do so - you immediately lose that page. I can't find any sequence or solution to showing it LOGGED IN - but it doesn't seem to matter.
When you then go to add a NEW NOTE (in Evernote Windows) There is a s