I had the same problem and just thought I'd share my findings (as it took me ages to find the answer).
- Sign out of App Store.
- Sign out of iTunes.
- Sign into the App Store.
- Sign into iTunes.
- Accept the iTunes Terms.
- Close both App Store and iTunes.
- Open Terminal
- Run the following command: sudo find /private/var/folders -type d -name com.apple.appstore -exec rm -rf {} ;
- Input password when prompted.
- Run this command to reboot your mac: sudo reboot
- After reboot open App Store and try to purchase a app.
Mac App Store Cannot Download Google Chrome
I currently own Office 2016 for Mac and want to upgrade my version of Office. Should I download Office from the Mac App Store? If you own the older perpetual release of Office, you can download the new version of the apps from the Mac App Store, and purchase a new Microsoft 365 subscription using the in-app purchase option. I want to download apps in the Mac App Store and the apps won't start to download. As you can see in the pictures below, the spinner starts spinning but nothing gets downloaded, the download simply doesn't start. I am logged in with my account. I tried logging out of the App Store and logging in again, restarting the Mac etc, nothing helped.
Cannot Download Apps From Mac App Store
That fixed the issue for me, I hope it does the same for you :-)