For Version 18:
Run the MSI with /qn /norestart
Suppress Update with this reg key:
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Update]
"Update{4DC8B4CA-1BDA-483E-B5FA-D3C12E15B62D}"=dword:00000000
On Aaron Parker's blog I saw that for version 15 updates can be suppresed using the following reg value: reg add HKLM\Software\Policies\Google\Update /v AutoUpdateCheckPeriodMinutes /d 0 /t REG_SZ /f
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