it can be downloaded month wise and from gst site 

go to returns >> select month >> gstr_2a >> download 

Install Demo of Gen GST Software (by Sag Infotech) by this software you can download consolodiated report, gstr-2a report & difference report between gstr-1 & gstr-3b.

Otherwise you can download month wise report from GSTIN portal...

It is Very Difficult to Install Demo Version of GEN Gst Software so Kindly Download the Software & call Sag Infotech Helpline they will help you in Installing 10 Hours Demo of the Software ..

The Link for Demo Version is :

https://saginfotech.com/Downlaodsetup.aspx

with help of Octa GST Assistant

Get a quick overview of return filing status of all months in a financial year. Download GSTR-1, GSTR-2A and GSTR-3B returns of the full financial year in just one click.

How to use Octa GST Assistant?

- Install the extension
- Open GST Portal and login with your credentials
- Open return dashboard

download link 
https://chrome.google.com/webstore/detail/octa-gst-assistant/ljnadbaeifgbakekpdcecdiefpbooihh?hl=en-GB
- Click on Octa GST Assistant icon in the Chrome toolbar

It can be downloaded monthly wise

You can you octa GST Assitant  https://www.youtube.com/watch?v=qg5YoVHMTBI