Ensure the physical USB token is plugged in before launching your browser. Check if the token's proprietary management software can read the certificate locally. If it can, but the website cannot, try opening your browser via the "Run as Administrator" option.

If you encounter technical issues during download or installation, contact the ISRO e-Procurement Helpdesk eproc@vssc.gov.in : +91-471-2565454 or +91-471-2564162 : 6 AM to 8 PM, seven days a week. ISRO e-Procurement Portal to the installation manual or help with vendor registration Procedure for ISRO e-Procurement client installation

No. Do not use mirrors. Government servers are often slow due to high traffic. Be patient. If the download fails, contact the technical support email listed on the official portal.