Somehow on following same steps in another laptop, it downloaded complete symbolist_BSE file of 558KB. Now, I am able to get BSE quotes now.
Issue is now closed. Thank you for your help.
yes, it was working fine till few days back. I can see SymbolList_BSE downloaded in mydocuments but its size is only 2 KB. I tried deleting it and again downloaded symbols few times but it always gets truncated to 2KB.