click ok and then go to system preferences.
Choose the Security and Privacy section and you can tell the system to open the app anyway.
A couple of years ago I downloaded the Crucial Memory Scanner here in the UK to identify what memory I had installed and what I might purchase to expand it. Now I want to add to the memory I already have so attempted to download the scanner again but Apple doesn't allow me to install it as the scanner is from an unidentified company apparently. Are there any other "scanners" that Apple will allow me to run please?