Mac App Store Not Responding. If the app store doesn’t close, press cmd + option + esc and force quit it. However, the mac app store is not, like all other app stores, without its fair share of kinks.

Tap general, then tap iphone storage (or ipad storage). Great app but keeps not responding i genuinely love using this app. Clearing your mac app store temporary cache can fix mac app store download problems.
If you don't have automatic updates turned on, you can open the app store, go to the purchased tab, and open an app's product page to see if an update is available.
After closing the app store, go to > shut down and power off your mac. It was just fine prior to the update. Delete the app preference file. Macs are renowned for just working, but sometimes you might run into.