This is pretty simple, cause it´s a .msi Installer. Just use
rem install GotoAssist
msiexec /i G2MSetup5.1.880_www_IT.msi ALLUSERS=2 /qn /L*v %TEMP%\Citrix-GotoAssist_version.log
rem instal g2m codec
g2m_codec.exe /silent
For more information about msi command line parameters take a look at the following Microsoft Page:
http://technet.microsoft.com/en-us/library/cc759262(v=ws.10).aspx
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