There is certainly a migration path from ProtectionPilot to ePolicy Orchestrator (but not free). You'd posted this message in the Consumer Support feedback section so I'm moving it to a more appropriate Corporate thread. You'll get an answer from a true 'expert' shortly.
Consumer Support Product Manager
Certianly you can migrate from PRP 1.5 to EPO 4.X. Here is the migration path:
PRP 1.5 -> EPO 3.6.1 -> EPO 4.X
Be sure to make a note of all your ports and take a backup of the DB after each successful version upgrade.