By default, Acronis Agent is installed and registered in the account specified during installation. When you need to install agents without registration and register them manually later:

1. Download the installation package (.dmg-file) from Cyber Protection console.
2. Open Terminal and create temporary DMG mount directory: 
   mkdir dmg_root
3. Mount DMG image:
   hdiutil attach Backup_Agent_for_MAC_x64.dmg -mountpoint dmg_root
   where Backup_Agent_for_Mac_OSX64.dmg is the installation package; specify path to the package in case it is located outside of the directory you are working in
4. Run installer:
   sudo installer -pkg dmg_root/BackupClientMacOSX64.pkg -target LocalSystem
5. Detach DMG:
   hdiutil detach dmg_root/

Later, you can register agents manually as described in this article.