Opening a case is a sure way to get the upgrade and any assistance required to get it correctly installed.
New versions and or service packs of the latest set of patches come out on a regular basis.
After contacting support, you will either be sent an email with a link to do a download of the requested version / patch, or it will be included via a secure file transfer email link.
Subject: Upgrading PIOM from 2.2 to latest version.
Initial Details: Hi Jim, As per your guidance I have opened a ticket for upgrading to the latest version. Please provide the link for download. Regards, Harish
UPDATED: November 21, 2017