The latest version of TDM is 4.8.1, but there have been patches provided since the GA version.
How to Download Test Data Manager 4.8.1 from the Broadcom Support Portal:
1. Login to the Support Portal.
2. After you log in choose Enterprise Software.
3. Choose Product Downloads.
4. Search for TEST DATA MANAGER.
5. Click on TEST DATA MANAGER link.
6. Choose Product CA Test Data Manager for Data Generation and Test Matching Seeding MULTI-PLATFORM for 4.8.
7. Download the below Components: (not sure if you are running Docker)
CA Test Data Manager Repository Kit 4.8.1
CA Test Data Manager Full Package 4.8.1
Documentation on installing:https://techdocs.broadcom.com/content/broadcom/techdocs/us/en/ca-enterprise-software/continuous-testing/test-data-management/4-8-1/installing.html