Installer for Elements 10 is an "unidentified developer" on my new Mac. How do I resolve this?

I downloaded Elements 10 from what I hope is the legitimate Adobe link, but my new Macbook Pro (with Mavericks) won't allow me to install it. Message is that my computer system won't install anything that isn't a Mac app or isn't from a recognized developer. Before I check my administrator settings and move forward, is this a legitimate download file: PhotoshopElements_10_WWEFDJ.dmg?