Sounds like Gatekeeper in OS X 10.8. If you downloaded the updates from Akai Pro's website there shouldn't be any "safety" issues. This probably just means that there is no developer certificate for Akai with Apple or none in this package/installer…not necessarily that it's unsafe or malicious.
> System Preferences > Security & Privacy > General > Allow applications downloaded from: Anywhere.
…if you want to disable this feature. Or, disable it temporarily to install the update.