Good question. At this time, we don't have a dialog within QIE that shows the upgrade history.
However, in the QIE Home directory (Usually c:\ProgramData\QIE\) you will find "preUpgrade_{date}_{time}" folders. These folders contain a backup of the qie.war, release notes, and the lib directory before the upgrade occurred. It is not a full history, as we only keep a couple of these folders at a time in case we need to manually recover from an upgrade.