Gatekeeper Prevents Installation of Supported Software
Mac OS X 10.8 (Mountain Lion)’s new Gatekeeper feature may prevent the installation of software distributed from TechWeb and supported by IS&T. Software developed by an “unidentified developer” will, by default, be blocked by Gatekeeper.
In addition to a ServiceNow knowledge base article regarding this issue, Information Security has created instructions for disabling (both temporarily and more permanently) Gatekeeper, which are available on their website.