Mac App Store Download Stuck. For whatever reason, the request for the update or the app ends up in a loop request that times out. Let's learn its causes first.
Go to mac app store and open updates. I have tried rebooting my system, quitting and reopening the app store, quitting the app store and killing the storeagent process via activity. If you are signed with an apple developer account, you can get access to products that are no longer listed on the app store.
If the installation get stuck when you try to update the mac from mac app store, you may download macos software from apple website, which is the combo updater which includes all the files required to update the macos.
How to check for app and macos updates in the mac app store; Find an app you want to download. Mac app store stuck on waiting to install? As you can see in the pictures below, the spinner starts spinning but nothing gets downloaded, the download simply doesn't start.