Q:

Running ie10, ie11 at same time for testing?

I recently installed ie11 on my Windows7 machine and do browser testing for all versions of ie on it in the document. I also do tests on Browserstack. I have client now that INSISTS I test on ie10 directly. 
As you know, Windows won't let you run multiple version if ie, un-install ie directly, or reinstall an older version when a newer version is already installed. I don't want to have to uninstall/reinstall ie11, reinstall/install ie10.
Is there a work around where I can run both version without have to uninstall one or the other? 

A:

On modern.ie you can find free virtual machines for every version of Internet Explorer.

