De acordo com esta documentação do technet :
To support synchronizing document libraries to a user's client workstation with the SkyDrive Pro Windows Sync client, you must have:
Either
Office 2013 Standard or Office 2013 Professional Plus.
An Office 365 subscription that includes the Office 2013 applications.
Client workstations running Windows 7 or Windows 8.
Portanto, se não for o Office 365, você precisa ter o Office instalado localmente.