Hello,
you can download a newer version from the Cisco website, but you need a CCO logon with enough privileges to do that. If you have a CCO logon, click on the link below:
http://www.cisco.com/public/sw-center/
If you do not have a CCO logon, you will need to purchase the IOS from a Cisco reseller or partner. AFAIK, the IP Only IOS costs around $40.
HTH,
GP