To get the elevators working with this mod there is a bit of a learning curve, but TheSimmer40 has a helpful tutorial on the download page. Essentially it uses the mechanic from the Realm of Magic (required) teleportation portals and pairs them up with animated elevator doors, so you can create from-scratch elevators. With this mod you can have up to 3 separate elevator units so you can place multiple around your build(s) as needed and they should be usable by all ages & species.

TheSimmer40 has also added newer elevator doors for use with the mod, but they require the respective pack(s) for wherever the original elevator mesh is from. You will need City Living, Discover University, and/or Eco Lifestyle to get access to the elevator doors.