installing Libreoffice on iMac

I have tried twice to download and install Libreoffice on my new iMac but keep getting the message that says Apple cannot verify that the file does not have malicious content. How can I progress?

Have you already installed Mac OS X 10.15 (Catalina)? If yes - type “Catalina” into the search field of this site.

Ignore “Verify”. Open Libre Office from “Dock” with right click / open after install.