Only on IE - complain about .js file version

Hi,
I'm working on updating the UI for an existing web forms application. On some pages, there are forms; the existing .aspx code uses jquery-1.7.1 to make the form validation work (for some reason, the form validation does not work with any later version); however, the new UI uses bootstrap.min.js, which only works with jquery 1.9.1 or later.
Now, these pages work in Chrome and FF, without an issue; but whenever we test it in IE, in debug mode, it threw an error saying the bootstrap.min.js can only work with jquery 1.9.1 or later.
Has anyone encountered an issue like this? Any suggestions on how to solve it?
Note; the new UI is responsive, so I think that I have to use bootstrap.min.js; so - how do I use jquery 1.9.1 or later version but still make the form validation work? I do not understand why the form validation only works with 1.7.1 - what is in 1.7.1 version that is related to validation that later version doe not have or work the same w ...