Mac OS X El Capitan (downloaded from App Store)

This a .dmg of Mac OS X 10.11 El Capitan released on September 30th, 2015.
It was downloaded directly from the App Store.
You can use it to make a bootable usb as shown in multiple tutorials on the Web and Youtube.

Here is the procedure to make a bootable usb:

1. Double-click Mac Os X El Capitan.dmg in the Finder to mount its volume. That volume will appear in the Finder as OS X Install ESD; open it to view its contents.
2. Several of the files you’ll need to work with are hidden in the Finder, and you need to make them visible. Open the Terminal app (in /Application/Utilities), then type (or copy and paste) the following command, and then press Return:

defaults write com.apple.finder AppleShowAllFiles 1 && killall Finder

(This tells the Finder to show hidden files—we’ll re-hide such files later.)
3. Launch Disk Utility (in /Applications/Utilities) and then drag BaseSystem.dmg (in the OS X Install ESD volume) into Disk Utility’s left-hand sidebar.
4. Select BaseSystem.dmg in Disk Utility’s sidebar, and then click the Restore button in the main part of the window.
Drag the BaseSystem.dmg icon into the Source field on the right (if it isn’t already there).
5. Connect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable El Capitan installer.
6. In Disk Utility, find this destination drive in the left sidebar. You may see a couple partitions under the drive: one named EFI and another with the name you see for the drive in the Finder. Drag the latter—the one with the drive name—into the Destination field on the right. (If the destination drive has additional partitions, just drag the partition you want to use as your bootable installer volume.)
Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data. Click Restore, and then click Erase in the dialog box that appears; if prompted, enter an admin-level username and password.
Wait for the restore procedure to finish, which should take just a few minutes.
7. Open the destination drive—the one you’re using for your bootable installer drive, which has been renamed OS X Base System. Inside that drive, open the System folder, and then open the Installation folder. You’ll see an alias called Packages. Delete that alias.
8. Open the mounted OS X Install ESD volume, and you’ll see a folder called Packages. Drag that folder into the Installation folder on your destination drive. (You're replacing the deleted Packages alias with this Packages folder.) The folder is about 4.6GB in size, so the copy will take a bit of time, especially if you’re copying to a slow thumb drive.
9. Also in the mounted OS X Install ESD volume, you’ll find files named BaseSystem.chunklist and BaseSystem.dmg. Copy these files to the root (top) level of your install drive (OS X Base System, not into the System or Installation folder).
10. Eject the OS X Install ESD volume.
11. You’ll likely want to re-hide invisible files in the Finder. Open the Terminal app, type (or copy and paste) the following command, and then press Return:

defaults write com.apple.finder AppleShowAllFiles 0 && killall Finder