Cannot install zoho mail desktop app for Mac (Catalina)

Cannot install zoho mail desktop app for Mac (Catalina)

Hi

https://help.zoho.com/portal/en/community/topic/install-zoho-mail-desktop-app-on-mac-book-pro-catalina-10-15-1-does-not-work

I tried the method shown in the link above to open and install but it does not work. Please advise.