1. Validate that CopyAclExtension.dll exists in C:\Windows\System32 (if it doesn't, copy it from a working core)
2. Run regsvr32 /u CopyAclExtension.dll to unregister it
3. Run regsvr32 CopyAclExtension.dll to register it
4. Restart the machine
Once that is done, you should have the options to "Copy/Paste with permissions" when right clicking on a Core, Agent or LMU machine.