This is probably a Gate Keeper issue.

Gate keeper doesn’t like downloaded files and dynamic packages. It may flag Lagvoid as “corrupted” and won’t allow you to run it.

In that case, go to System Preferences, click the Security & Privacy icon, go to the General tab, click the lock in the bottom left corner to make changes, type in your password then click the Unlock button. You have the following options under “Allow applications downloaded from: “Mac App Store, Mac App Store and identified developers, Anywhere”

Tutorial from IT World