Your link isn't working for me.
OK, downloaded but cannot run because Apple does not recognise it as one of its apps.
... it is from an unidentified developer.
Your security preferences allow installation of only apps from the Mac App Store and identified developers."
Yeah, I shall try this again for you. I have been doing this right click to override it but a second window comes up from Apple preventing me. Just having another go.
I ticked a box to tell them to stop sending the message and I am in the middle of downloading now.