When you try to download a mar file from the portal in DevTest 10.2 , the name of the mar file is not readable ( ekPLmqbA260.mar ) . In prior versions, we did not face this issue. The mar files are downloaded with the same name as the VSM.
This is a known defect for DevTest 10.2
Please open a ticket with CA Support, we have a patch for downloading the mar with the same name as the VSM.