Hi dert, if you want to manually download a DAT for ePO you have to download it here:
If you're using an automated task and it has failed last night then launch the task again as there has been some problems with corrupted DATS last night
The OP is in India, so I think they would want English?
You can download the DAT file from 'http://www.mcafee.com/apps/downloads/security-updates/security-updates.aspx'. Please download the file 'DAT Package For Use with McAfee ePO' and check in to the ePO server.