You will log into the government portal and GSTZen will download your GSTR-9 from government portal.
On the GSTZen homepage, click on GSTR-9C - 2017-18
Click on Login to GST Government Portal with OTP
Enter your GSTN portal username and click on Confirm GSTN Portal username and request OTP
Enter the OTP and click on Login with OTP
Click on Download
Click on Yes, Download data
Your GSTZen home page where you will find the link to file your GSTR-9C
Download your GSTR-9 from government portal
The PDF shows filed GSTR-9 information for your reference.