User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Options > Preferences > Calendar Options
User
HKCU\software\policies\microsoft\office\16.0\outlook\options\calendar
This policy setting hides the "Send Latest Version" button and prevents it from appearing on out-of-date meeting forward notifications and responses. If you enable this policy setting, the "Send Latest Version" button be hidden on out-of-date meeting forward notifications and responses. If you disable or do not configure this policy setting, the "Send Latest Version" button will be turned on.