Update to read first:
You need to install IS2012 SP1 to get these prereqs. See:
InstallShield 2012 Spring Service Pack 1 is Now Available!
Otherwise the PRQ XML can be found at:
Additional background information:
InstallShield comes with a prerequisite editor that you can use to define your own PRQ files. For a tutorial see:
Using InstallShield 12 to Install .NET Framework 3.0
Note: The PRQ schema hasn't changed in a long time. You can frequently install a trial version of InstallShield on a VM, find a new/updated PRQ and then back port it to your 2010 environment. Add it, build and test and it usually works fine. Also sometimes InstallShield will have expansion packs and addon installers to add these without rereleasing the product.