I had a recent odd situation on my 2011 iMac, which is limited to High Sierra. I updated iWork as far as I could, and Pages & Keynote work fine. Numbers did not, however, and actually has disappeared off my App Store “Purchased” list, although the other iWork apps are still there. I reinstalled from the iWork '09 package, but now it is insisting that my 30 day trial period is up (???) and I must purchase Numbers which, of course, is no longer available for High Sierra on the App Store. (FWIW, Numbers works fine on my iPad, but I need the 27" screen and mouse for work.)
So I’m in a bit of a vicious circle.
Apple Support was unable to help other than to recommend using iCloud Numbers. Fine. Except… ⌘ click doesn’t work to select multiple cells, and the problem isn’t my keyboard.
If anyone has a solution to either of these bug/feature/issues, I’d be grateful to hear it.