I was able to install the app by going to System Preferences/Security and Privacy and clicking on allow Correl software to run. This made it possible to install the app but I needn't have bothered as I can't get the app to even load. Starts up and then hangs immediately even with the latest download.
UPDATE: Having deleted all previous files and reinstalling, restarting, updating and restarting I am now able to get the program to load even though it hangs for a lengthy period at the start. It eventually loads but would have to be the slowest loading application that I have seen in years.