Upgrading to Receiver 4 requires the removal of previous versions.
Citrix provides a tool to do this.The ReceiverCleanupUtility can be obtained from the Citrix website.
http://support.citrix.com/article/CTX137494
Use the /silent string for silent running.
You must restart the computer after running it for it to finish removing any Single Sign-on services and before attempting to install new software.
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