Taking backup and new installation of NGL

[ashoksatapathy]

Dear Siddharth Sir,
After a long time I am communicating you and expecting your good health.

1. Sir, when I take backup in NGL3.1.1 is it necessary to click on "Add Comments" in the last part?

2. Please provide me the URL to download 3.1.5 for new installation. Is their any new procedure involved to install this version.

Expecting your early support.