Microsoft has just released (December 3rd 2015) a new updated version of Azure Active Directory Connect (Azure AD Connect).
Azure AD Connect is the tool to connect your local Active Directory with Office 365 and Azure Services. It’s The tool to integrate your AD Forest or Forests with Azure and Office 365 services.
It performs synchronization of AD objects and identities between Active Directory and Azure Active Directory.
This new version is build: 1.0.9131.
Download it from here: AzureADConnect.msi (From Microsoft Download)
Be aware that you have 12 months to apply this upgrade to stay in a supported state.
How to install Azure AD Connect, please see the guide from Microsoft: https://azure.microsoft.com/en-us/documentation/articles/active-directory-aadconnect/