You can download the IE11 blocking mechanism from here: Toolkit to Disable Automatic Delivery of Internet Explorer 11
What IE11_Blocker.cmd does…
http://www.microsoft.com/en-us/download/details.aspx?id=40722
When the .cmd is run a new registry key is created:
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Setup\11.0
Type: REG_SZ
Name: DoNotAllowIE11
Data value: 0 or empty = not blocked; 1 = blocked.
IE11_Blocker.cmd has several command-line switches available to perform additional functions. The options are:
/B (blocks IE11 from installing on the local computer)
<ComputerName> /B (blocks IE11 from installing on a remote computer you specify)
/U (unblocks the automatic delivery of IE11 on the local computer)
<ComputerName /U (unblocks the automatic delivery of IE11 on a remote computer you specify)