Yes, "look in Applications" may sound dumb, but be sure to check there carefully, especially Applications/iWork.
("Upgrading" to OSX 10.11 El Capitan left the to-me-useless Pages 5 in Applications. But I'll say this for them, Pages '09 4.3 was filed away in Applications/iWork '09. Since I use no other part of iWork, and never thought of myself as using "iWork," I never would have thought to look there.)
Outlining was the only reason I used Pages, and they dropped it. Collapsing text, not external links, was the smart part of hypertext, and we've been missing it since it was dumped in early web days.