Error message | Apple Gatekeeper installation problems
Having trouble installing the software on your Mac? This may very well be due to the Mac’s security settings. You can resolve this as follows:
Step 1: Under Settings, go to Security & Privacy
Step 2: If necessary, click on General, and on the lock symbol to change your settings.
Step 3: You will now be asked to enter your administrator password. Once you have done this the options are enabled.
Step 4: Next, under ”Authorise programmes downloaded from” select the last option: “Any random source”.
Step 5: You can now close this screen and install the software.