Iam trying for bulk download orders of Landsat 8 data from earthexplorere site, its almost 1 month crossed, but its showing as not started in the status.
Loggin to earth explorer then add the data in bulk download list then download the BDA application from the USGS website https://dds.cr.usgs.gov/bulk then go to your basket and download the data
If you know how to deal with python I can suggest to try with this package: https://pypi.org/project/landsatxplore/ or try to make your own python program using the earthexplorer API shown in the same package.
You need an account on Earth Explorer to download imagery:
https://earthexplorer.usgs.gov/
Then you can search for what you want - choose the collection as Landsat Collection 1 Level-2 Surface Reflectance on Demand - this means you need to order the scenes - wait for them to be processed and then download them.
It works well if you don't have many scenes, but if you have a lot you may want to try using the Bulk Download script: https://github.com/USGS-EROS/espa-bulk-downloader
To use the bulk down loader - i.e. get all of the scenes - follow the install instructions for it on github and run the script like this:
download_espa_order.py -e [email address of earthexplorer account] -d . -u [username of earthexplorer account] -o [the order number sent to you by email]