CERSAI Error- could not connect to E-Lock SignApp

if query _ cersai.org. in says Could not connect to E-Lock SignApp.

go to
https://www.cersai.org.in/CERSAI/down...
Download-Click Page 2- Utility - Digital Signature Utility-check 4th place (download it now & run)

Download & Run : Digital Signature Utility
After Installation If show invalid serial number means download sucessfully : Now Restart you PC/ Laptop