Works fine on my iPhone. A pop up box suggests updating Safari. Did that with no change

Well that did it. I downloaded Chrome and radar works great.

Thanks

My Mac is El Capitan 10.11.6 and Safari is 11.1.1

Works fine on my iPhone. A pop up box suggests updating Safari. Did that with no change

Can not get radar on my iMac desktop. It works fine on my iPhone7. A pop up suggested I update my browser which I have done but still no radar. Any ideas?