Pl see instructions on this webpage - http://www.oracle.com/technetwork/middleware/weblogic/downloads/wls-main-097127.html
"For existing customers requiring access to prior WebLogic Server versions, please refer to the
instructions at My Oracle Support Doc ID 1071023.1 ‘Requesting Physical Shipment or Download
URL for Software Media'."
You will need to log an SR with Oracle Support at https://support.oracle.com, access to which is given to customers with a paid support contract with Oracle. The software is no longer available for public download