Before you apply a PowerExchange hotfix on z/OS, verify that the license key is valid. The InstParm file from your current release contains the license key. As part of the hotfix installation, you copy the InstParm file to the temporary directory that you create for the hotfix.
Also, verify that the z/OS Installation Assistant is installed on a 64-bit Windows system. The installation will fail if you attempt to run the z/OS Installation Assistant from a 32-bit system.