Help! Cancelled OTA update, now can't get it back

A

AC Question

I was in the middle of something when I received an update notice on my phone for the latest update with wifi calling and Sept security patches. I clicked No Thanks, thinking I could do it later. Now, whenever I go to check for updates it says I'm up to date. I've also tried using the Software Update assistant and it also tells me the software is up to date. Is there anything I can "clear" to allow me to get the update, or some other method I can get it?

Thanks!