Dear Suraj,
First of all, is there a reason you are using SAM 2015.6.30 instead of the current version, SAM 2016.3.14? I would recommend using the latest version unless you have a reason to use the older version.
For the moment, SAM cannot automatically download weather data for locations in the South Asia region. You can download files from the NSRDB website to use in SAM. We are working to fix that -- eventually it will be possible to type a street address or latitude and longitude for locations in the part of Asia covered by the NSRDB database.
Here is the link to the NSRDB Viewer that you can use to download the data:
https://nsrdb.nrel.gov/nsrdb-viewer
Best regards,
Paul.