Question:
How to upgrade Receiver from StoreFront?

Answer:
1. Go to C:\Program Files\Citrix\Receiver StoreFront\Receiver Clients\. Create a Windows folder if it doesn’t exist.
2. In the Windows folder, paste the Receiver for Windows with the version you want to set as the threshold, overwriting the existing file if one exists. Rename the file the CitrixReceiver.exe if it isn’t already. Do this on both StoreFront servers.
3. Go to C:\inetpub\wwwroot\Citrix\StoreWeb and edit the file Web.config. Scroll down to the pluginAssistant section. If desired, change upgradeAtLogin to true. This enables StoreFront to check the installed version of Receiver and offer to upgrade.
<pluginAssistant enabled="true" upgradeAtLogin="true">
4. Close and save the file.
5. Propagate Changes to the other StoreFront servers.

After the setting, the SF will compare the Client side Receiver with the Receiver installation package under path C:\Program Files\Citrix\Receiver StoreFront\Receiver Clients\, if the client's version is under installation package, upgrade warning will be prompt at client side.