You will have to install MDM yourself on a sandbox environment. You need to reach out to Informatica Shipping (via a Shipping ticket) to get the MDM download links for the version you want to install. The latest is MDM 10.3 HF2 and an upcoming MDM release 10.4 will be out in end of Feb.
Thanks for the response Anuvinda.
Can you please share the process to be followed to reach out to Informatica Shipping ?
You need to raise a support case (of type Shipping) from the Informtica MySupport portal and mention details on which MDM version's donwload links you want.