For the Catalyst 4500-E series, supported IOS versions include 12.2(54)SG, 15.0(2)SG, 15.1(2)SG, and 15.2(2)E (and later). The format is:
He grabbed a handheld floor fan from the corner, aimed it directly at the chassis intake, and held his breath. He watched the logs. The file was huge—hundreds of megabytes of universal crypto code and routing logic. [OK - 185634816 bytes]