To add a little to your options try to do a seach on the web for batch printing to pdf instead of save as.
Thank you very much for your help. I found it under task scheduler export files option.
I tried to search to search "export files" in task scheduler earlier but might have missed that we also have an option to export as PDf over there.
By the way I have another doubt. can you please look into it : https://forum.solidworks.com/message/421149#421149
Really appreciate your help.