Tds certificate not downloaded

MYTIFICATES FOR PRE TDS CER QUERY IS REGARDING TDS CERTIFICATE.

IS IT MANDATORY TO DOWNLOAD THE TDS CERTIFICATE. I HAVE NOT DOWNLOADED IT FOR THE PREVIOUS 2 QUARTERS. THE TDS AMOUNT IS ALREADY SHOWING IN FORM 26AS, WHICH HAS BEEN CLAIMED BY THE PARTY.

SO IS THERE ANY PROBABILITY OF THE DEPT. RAISING ANY DEMAND IN NEAR FUTURE FOR THE SAME.

THANKS IN ADVANCE....