By Anil Menon-Oracle on Dec 04, 2015
It is available as "Patch 21977765 : OWB-TO-ODI MIGRATION PATCH (MP3) FOR OWB 220.127.116.11 TO ODI 12.2.1" and can be downloaded from the support website.
This patch(21977765) only supports migration from Linux 64-bit and Windows 64-bit standalone OWB 18.104.22.168 to ODI 12.2.1.
For Migrating to ODI 12.1.2 and ODI 12.1.3 please use patch no 18537208
More information about the migration utility is here