1. Can you plug your Mac into ethernet access at work?
2. not really sure what you mean by 'secure mode where you can install el capitan'. Sounds like your IT department may have things arranged so that Macs cannot connect. Perhaps your IT department can help you get wireless access.
3. Take your mac somewhere else where there is internet access.
4. Take your mac to your local Apple Store. They'll help you.
5. If you have access to another Mac that does have internet access, perhaps a friend that has a mac, you can download the El Capitan installer and put it on an 8 GB flash drive (thumb drive) with diskmaker X http://diskmakerx.com/ . Then you can use the flash drive to boot your Mac and install El Capitan.
6. why did you need to reinstall El Capitan?

1. Install El Capitan Without Internet Security

Jul 18, 2013 How to install OS X on a new or faulty HD without Internet recovery. Corrupt and new disks might not have a working Recovery partition, but there are still ways to access one and reinstall OS X. Post Installation is Easier: Just like windows you have to install drivers to make macOS perfect, which is pretty hard for beginners but Sierra Installer automatically do this for you by installing most drivers automatically, and Sierra Installer also installs the Bootloader for you, but you may have to install additional drivers manually in. The latest Hackintosh OS X El Capitan 10.11.5 Mac operating system is now available for Microsoft Windows device users to experience the all new features and functionalities of OS X El Capitan 10.11.5 (Build: 15F34) on Windows PCs and Laptops powered by AMD and Intel based hardware. Once you’ve done that, here’s how to install, reinstall, or upgrade to El Capitan, step by step: Boot from your Recovery HD partition by restarting your Mac while holding down the Command+R keys. The OS X Utilities window appears. Select Reinstall OS X, and click Continue. The OS X El Capitan splash screen appears.

Dec 17, 2015 3:40 AM

Download El Capitan

Download: OS X El Capitan This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder.

Download El Capitan OS X is also significant since it’s the last version of Apple Mac OS X released as its successor Sierra was released in the year 2016 under the brand macOS.

El Capitan latest version

El Capitan 10.11.6 is now released as the latest version of Download El Capitan . For OS X El Capitan users this update is recommended. The upgrade to OS X El Capitan v10.11.6 enhances your Mac's reliability, performance and protection and is advised for all users. Solves a problem that can prevent parental control accounts from saving settings. El Capitan Download latest version solves an issue, which prevents access to SMB sharing points by some network devices, such as speakers and multifunction printers. It improves startup time for the NetBoot server connection. Solves a problem that can make authentication of Active Directory longer than anticipated.

At the time of release, El Capitan was promoted as a significant release by Apple similar to how they promoted Mavericks and Yosemite upgrades which were the predecessors of El Capitan.

OS X 10.11 El Capitán

This update is recommended for all OS X El Capitan users.

The OS X El Capitan v10.11.6 update improves the stability, compatibility and security of your Mac and is recommended for all users.

This update:

• Fixes an issue that prevents parental controls from saving settings in enabled accounts.
• Fixes an issue that prevents some network devices, such as speakers and multifunction printers, from accessing SMB partitions.

Enterprise Content:

• Improves boot time when connected to a NetBoot server.
• Fixes an issue with a netboot image created with OS X v10.11.4 or OS X v10.11.5 installer preventing it from booting.
• Active directory authentication fixes an issue that may take longer than expected.

System and Hardware Requirements for Download El Capitan

• System requirements : You should have OS X v10.6.8 or below version and 2GB memory. And should have 8.8 GB of capacity. Apple ID is required for certain features; terms are applicable. Certain features include an Internet service provider that is compatible; fees can apply.
• Hardware requirements : MacBook (early 2015)/ MacBook (late 2008 Aluminum or early 2009 or newer)/ MacBook Pro (Mid or late 2007 or newer)/ MacBook Air (late 2008 or newer)/ Mac mini (early 2009 or newer)/ iMac (mid 2007 or newer)/ Mac Pro (early 2008 or newer)/ Xserve (early 2009).

Features of OS X 10.11 Download

Install El Capitan Without Internet Security

• Safari has new features in the El Capitan update. It allows you to easily pin the tabs in the browser to the tab bar so that you can easily access them in the next time
• It has multi-touch gestures to applications like Mail and Messages. And it uses the gathered information of the individual emails on the apps like Calendar
• The Maps feature in the OS X 10.11 offers you the information about public transportation
• Notes feature has added more powerful text processing capabilities. Under this improvement, you can add to-do-lists just like the Reminders application, map locations, photos and videos, inline webpage previews, digital sketches, and other media types
• The Spotlight feature is more improved with more contextual information
• The Photos feature in the El Capitan can now use editing tools from other apps
• The System Integrity Protection gives you more protection to the OS X El Capitan running Mac computers and laptops