The websites of Platform Options vendors may contain additional information about how they work with other hardware or software options on this list. If vendors state a particular combination will not work or is not supported, that combination will not be supported by Pegasystems.
• Applications built on Pega Platform may not function correctly if run on platforms which are not approved for Pega Platform.
• Prior versions of Pega Platform may not work with the most recent Platform Options.
As of Pega 7.4, Java 7 is no longer supported, so this application server is no longer supported at least you need IBM WebSphere 8.5.5.