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“Dropbox is damaged” error when trying to replace Dropbox folder from a backup on macOS

After installing a new motherboard on my iMac (Sequoia 15.1), I downloaded Dropbox again. When I try to replace it with the old Dropbox from my backup, it says “Dropbox is damaged and cannot be opened”. It seems that I lost all the data it contained. Is there a way to recover this data ?

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Hannah

Thanks for bringing this to our attention, @CljrRt.

Are your files still available, when you login to your account on dropbox.com?

If so, instead of trying to replace the Dropbox folder, I would suggest installing the Dropbox app, signing in and just allowing it to sync your files instead.

Let me know how that goes.