WSUS and IE 11

Several of our users have Internet Explorer 11 but our image only has version 9.   Machines updates are controlled by WSUS GPO settings and approved updates of which IE 11 is not approved.  How would these users get Internet Explorer 11 if our WSUS GPO settings do not allow them to perform their own updates and IE 11 is not approved?  After inquiring, these users did not initiate the update.
Who is Participating?
IE11 is not an update, it is fulll product. May be they downloaded and installed it manually?
WPincusITAuthor Commented:
The users do not have administrative privileges on their machines to install software.
In this case you can only look log files and try to find when and whom it was installed
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