Apple's macOS has a feature called “Gatekeeper” that secures your Mac from unsigned software, forcing it to only run Apple-approved software by default. However, you are still free to run any application. The xTuple ERP+CRM application may present macOS users with a security warning when users first run the xTuple Desktop Client. xTuple is currently working with Apple to resolve this issue. In the meantime, see the steps below to work around this known issue.