How do I download Mountain Lion onto my other iMac, after the initial install?

I am wondering how to download Mountain Lion onto my second iMac, after the initial install.  I understand the purchase is for multiple computers, but I have completed the install on my first iMac.

Once you’ve purchased Mountain Lion, find the installer on your Mac. It’s called Install OS X Mountain Lion.app and it should have been downloaded to your main Applications folder (/Applications).
Right-click (or Control+click) the installer, and choose Show Package Contents from the resulting contextual menu.
In the folder that appears, open Contents, then open Shared Support; you’ll see a disk image file called InstallESD.dmg.
Launch Disk Utility.
Drag the InstallESD.dmg disk image into the bottom (empty area) of Disk Utility’s sidebar (on the left).
In Disk Utility, select InstallESD.dmg in the sidebar, and then click the Open button in the toolbar to mount the disk image’s volume in the Finder. The mounted volume is called Mac OS X Install ESD, and it also appears below InstallESD.dmg in Disk Utility.
Select Mac OS X Install ESD in Disk Utility’s sidebar, then click the Restore button in the main part of the window.
Drag the Mac OS X Install ESD icon into the Source field on the right (if it isn’t already there).
Connect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable Mountain Lion installer.
In Disk Utility, find this destination drive in the left-hand sidebar and then drag it into the Destination field on the right. (If the destination drive has multiple partitions, just drag the partition you want to use as your bootable installer volume.) Warning: The next step will erase the destination drive or partition, so make sure it doesn’t contain any valuable data.
Click Restore, and then Erase in the dialog box that appears; if prompted, enter an admin-level username and password.
How to make a bootable Mountain Lion install drive
https://www.macworld.com/article/1167857/how_to_make_a_bootable_mountain_lion_in stall_drive.html

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