Apple Store Error (20) - Can't download updates

Good morning,
it's more than a month I'm trying to download the updates from the app store.
In particular I need to update Pages, because a colleague sent me some documents written with Pages 5.2.2 and I can't open them because I have the 5.1 version.
How can the app store problem be fixed?
Thank you in advance.
Regards,
Carlo

Sign out of the App Store and sign back in. Try to update again.

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