Did you get any error message when the issue occurred? Have you checked if you can download other things?
Based on my research, you may try the suggestions that be mentioned in the link below and check if it helps:
TechNet Community Support
the Coupons.com IE addon is known NOT to be compatible with IE9.... Contact the addon vendor for assistance with their addons.
for consumer help with IE select the Help>Online support menu and follow the prompts for your windows and IE versions.
this forum is for Questions regarding Internet Explorer 8, 9 and 10 for the IT Pro Audience. Topics covered are: Installation, Deployment, Configuration, Security, Group Policy, Management questions. If you are a consumer looking for answers or to raise a question, it's highly recommended you head on over to http://answers.microsoft.com/en-us
Actually, the Coupons.com coupon printer addon is compatible with Internet Explorer v9, although I have encountered a few customers for whom it doesn't appear to work as well and they have better results with Firefox or Google Chrome. In all cases, make sure that the addon is actually enabled in the browser first, then clear cache and cookies, restart the browser and try again. If we can assist, please email email@example.com.