I'm glad it's working Esther1981!
It's
always a good idea to back stuff up before installing even a Stuff Pack like
High-End Loft, just in the event something goes wrong.
While I've never heard EA say "officially" there's a specific order you HAVE to install the specific Expansions / Stuff Packs in, technical support (when they advise you to remove and then re-install the game) instructs you to install the Expansions and Stuff Packs you have in the order they were released.
When I pressed them on why it mattered, tech support didn't elucidate / got mum. So as Metro Man said, it's probably the very "safest" way to install, but (theoretically) it shouldn't matter.
I'm pretty sure the issue is how EA distributes patches / updates. Those are delivered in chronological order to support the new features or requirements of new Expansions or (with
Fast Lane) new in-game behaviors.
I'm glad it's working for you, and since it's working, I'd not expect any problems. Glad you are enjoying your "High-End" stuff!
-- Happytime