Use the EpeOaGenXML.exe file as an input to create the offline activation package. Extract this file from the Drive Encryption build that you downloaded from the download site.
Make sure that you have access to the latest Drive Encryption build.
Download the latest Drive Encryption build to a temporary location on the target system.
Extract the EpeOaGenXML.exe file from the product build to the temporary folder on the target system. The EpeOaGenXML.exe file is available at
TDE-8.0.0.363.pkg-2\TDE-8.0.0.363\DE Misc\Drive Encryption Admin Tools.