Applications from "APS" Catalog not registered in Plesk after migration from Plesk 12.5 to Plesk 17.5.3 in Home > Tools & Settings > Application Vault on the target server.
Domains have migrated successfully and are available.
Joomla, Prestashop, magenta or other "APS" applications installed on the migrated domains.
This is Plesk Migrator bug with IDs #PMT-4000 that was fixed in Plesk Migrator 2.12.0 .
No specific actions are required. The Plesk Migrator extension is updated automatically.