Mac OSX Catalina: can’t be opened because Apple cannot check for malicious software

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Mac OSX Catalina: can’t be opened because Apple cannot check for malicious software
macOS cannot verify that this app is free from malware.

Solution:

check with Security&Privacy settings under System Preferences to lift the Gatekeeper blocks, and fix alert messages.
when you are using Catalina, the warning message reappears every time you open the non-notarized app
open Terminal and run the cmd below

xattr -d com.apple.quarantine /Applications/<your App‘s Name>.app

e.g.: 
xattr -d com.apple.quarantine /Applications/qbittorrent.app

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