MacOS – HP Easy Scan – “HP Scanner 3” will damage your computer

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I have been using a HP Envy 4500 printer with my iMac for 2 years using HP Easy Scan – with no issues.

Today I tried to scan a document, when I press the "scan" button on the app a pop-up appears stating:

"HP Scanner 3" will damage your computer 
this file was downloaded on
an unknown date. Report malware to Apple to protect others

A second popup also appeared stating:

Scanner reported an error
Failed to open a connection to the device

To me this indicates the macOs has decided to block the program.

Why has this started happening? and how can I tell macOS that "HP Scanner 3" is no malware.

Edited to add:Using etc built in Apple/macOS scanner (which doesn't have all the features of HP Easy Scan) works so that proves this is not a hardware issue.

Best Answer

Edit: While the app now launches, it still won't let me scan. Found this https://forums.macrumors.com/threads/hp-driver-framework-broken-in-catalina-10-15-7.2262865/post-29100622 saying that the certificate from HP has been revoked, and we're SOL until HP fixes it.

I had this same issue this morning, did a search and found this. Apparently there is a version it the App Store. I downloaded that and boom it's working. Guess they want you to use the one that's been "vetted".

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