As you may be aware, Microsoft announced that as of Jan 12, 2016, IE 11 is the last version of IE which will continue to receive updates and Internet Explorer 11 will be supported for the life of Windows 7, Windows 8.1, and Windows 10.
The older versions namely IE9 and IE 10 are now in End of support which means there will be no more security updates, non-security updates, free or paid assisted support options, or online technical content updates. Given that there are potential risks of using the older IE versions, webMethods will now support only IE 11 starting with webMethods version 9.5 and later. Our documentation will be updated accordingly.
On behalf of webMethods Product Management