You will find it in your Applications folder. Called "Install OS X El Capitan" Just cancel the install splash screen.

Never mind...misunderstood the question.... :/

If you want is as pkg i recommend createOSXinstallPkg then you can publish it to SelfService, dont forget to configure restart option "Startup Disk" to "OS X Installer". This setup doesn't need a script.

@gavin.pardoe I've not looked at this for so long. Thanks :)

After you download the .app from the Apple Apps Store you can just drag the .app into Casper Admin. I am doing this for El Cap 10.11.4. What version of the JSS are you using? I know that currently it works very well 9.82. I have also used what Jens.Mansson mentioned and that did work very well for us before.

Once loaded into Casper Admin and replicated (if needed) you can move to create your policy. Yes reboot options are very important. We are deploying this way in a pretty large organization. I am allowing OS X update from Self Service.

@dvasquez cheers, didn't know that OSX app file worked in Admin (1month using macs and casper)

I didn't know the .app could be dragged straight into Casper Admin. Up til now I've been using the method mentioned by @Jens.Mansson

Might take a look at that functionality with the version after El Capitan as I'm running JSS 9.82

@sancheeto I just drag El Cap into Casper Admin and run it on target machines. Works well!

yup, same! .. then use it in imaging configurations for any mac model.....
sorted!

If putting the app into Self Service- I would assume the restart option would need to be set to OS X installer- any other special settings-

@EvstersTech No other settings needed, a good information window that you force the users to read is a good way to eliminate questions and let them know how long it takes. If you have filefault enabled then the authentication option in restart-tab is needed if you want to help users to skip that extra auth before osxinstaller triggers me thinks, not sure tho, have to test further.