Good afternoon. My very first post on here so I hope that I am doing this correctly. I received a Celestron Astromaster telescope for Christmas and when going to set it up this morning, a leaflet in the box recommended to install the Starry Night Celestron Basic Edition onto my computer. So I downloaded the software, had my user name and Registration Number ready but when I double click on the download on my computer, I just get the picture below.
I am wondering if I am doing anything wrong. My computer is an iMac running macO/S Big Sur
Many Thanks for any help you may be able to offer.