Looks like this migration tool causes a lot of issues
I seen more threads on the community.
Would be nice to have somebody from McAfee that could clear out things about this migration option
Is there a clear instruction?
I am actually in the process of migrating one of our ePO environments as well.
I stood up a brand new ePO server and DB, then added the new server as a registered server in the old. This will allow you to transfer all the systems from the old to the new. For the system tree, client tasks, policies, queries, users, tags, etc. I just exported all of it from the old, then imported into the new. Once you have the new server all setup, you can start transferring systems from the old -> new and tailor as needed.
If you need to use your old DB, create a .bak of it, attach it in the new SSMS, configure ePO to point to it, and then perform the above. Or just use a brand new setup and retain a .bak of the old setup.