Pages won't open after update
I have a MacBook Air with macOS Mojave 10.14.5. Yesterday I updated Numbers, Pages, and Keynote. The new versions of Numbers and Keynote work fine, but whenever I click on Pages (according to the App Store, the new version is 8.1) - whether the app itself or on a Pages document - the app icon will bounce twice, the dot will briefly appear beneath it to indicate that the app is open, and then it will disappear and the app will be closed. I then get a notification about Pages closing unexpectedly and what do I want to do, etc. (I have now reported to Apple three times.) I tried restarting but it made no difference. Should I just use Time Machine to revert to a previous version, or is there a quicker fix? Also, shouldn't the problems with an app after updating all have to do with *anything* but actually starting up? Like, isn't that the absolute *first* thing that the developers would check...?
MacBook Air 13", macOS 10.14