To download the latest version, use this link:
http://dl.google.com/drive/1.5.3449.3345/gsync.msi
Download online installer to check version.
https://drive.google.com/ob?page=thanks&usp=web_ww_dl_sync#
Once you know the latest version.
Edit the path below and download the MSI.
https://dl.google.com/dl/edgedl/drive/1.14.6059.0644/gsync.msi
Get the offline installer from http://dl.google.com/drive/1.0.2960.1377/gsync.msi
Install as a standard MSI
msiexec /i gsync.msi /qn
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