As far as I know by going to Settings>Apps & Games >Manage all applications > All you can then scroll down to the Silk browser App and either:
1. Force Stop
2. Clear Data
3. Clear Cache
4. Clear Defaults
But you can't force an update. They just pop up when Amazon is ready with them. There is an option to Uninstall Updates that is greyed out when the browser is running. You can go to Settings then scroll down to Sync Device though which will let you know if something is ready for updating (or download any books you have ready for download that haven't as yet).
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