Hello John, It could be a permissions issue, but since the installer is trying to install a JRE that is a part of the product from the installation package, it should not be an issue with a copy of Java already on your system. I am not sure what the "usual solutions" you tried are, but here are the ones that I can think of: 1. Are you running the installer as Administrator? 2. Does the file D:\applications\appdynamics\Platform\installer\jre\bin\server\classes.jsa exist and if so, what permissions do you have on it? If the file does not exist, what folders in the path exist? 3. Are there any other errors in the install log, especially preceding this one? 4. Have you tried re-downloading the installer and reinstalling, in case the installer package was somehow corrupted? For reference, here is the document on EC installation: https://docs.appdynamics.com/display/PRO45/Install+the+Enterprise+Console Regards, Jonathan ... View more