Questions have arisen as to whether TDM is compatible with DB2 v12
Q) Is DB2 V12 supported on TDM 5.4.14 for Mainframe?
TDM 4.3, 4.4, 4.5, .4.6
A) It will work, however not certified as of April 2018
Video URL on how to open a Support Case - https://communities.ca.com/videos/5898-demo-how-to-open-a-support-case
You can download the latest version of TDM by following the directions in this document: https://support.ca.com/us/knowledge-base-articles.TEC1903942.html.
To contact support, go to https://www.ca.com/us/services-support/ca-support/contact-support.html.