To make fully unattended install package you need to do following steps:
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Download install package: http://www.microsoft.com/en-us/download/details.aspx?id=45015
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Extract package content:
CRM2015-Client-ENU-i386.exe /extract:c:\CRM_TEMP\1\2
Do not remove sub folders 1 and 2 from the path, because we need it later -
Create Redist folder in c:\CRM_TEMP. Do not put it in the sub folders