Some of the applications like HP Application lifecycle management, can only run in IE 8. However, the IE is updated by windows automatically. Windows 7 users have IE11 in their machines.
When you need to downgrade IE, you could:
1. Control Panel / Programs / Programs and Features
2. Vies installed updates / “Current IE”
3. Remove IE11 update will get back IE10, continue to remove until you get back IE8.