The purpose of creating the offline activation package is to install and activate Drive Encryption offline on a client system that is not connected to a network or to the ePO - On-prem server.
After creating and downloading all required packages and MSIs, you must them to the client system and run them one at a time to install and activate the Drive Encryption software on the system.
Before you perform offline activation on the client system:
Make sure that your client system is not connected to network and not managed by the ePO - On-prem server.
Make sure that your client system has an administrator account with sufficient rights for installing and activating the Drive Encryption software.
Make sure that you have copied these files to a temporary location on the client system:
OfflineActivation.exe
DriveEncryption.msi