If your installer is registered as a handler for the eclipse+installer: protocol, you can click this configuration link to install the IDE.

Otherwise...

1. Download the eclipse installer.
2. Copy this configuration link to the clipboard.
3. Opening the installer, go to the menu in the top right and click on the "apply configuration" link.
4. Keeping the preset options, click the Install button
5. Grab a coffee and wait for the install to finish, it can take between 2 - 5 minutes. Ignore any warning messages that pop up
6. At the end, a Trust screen will pop up (pictured below). Use the "Select All button" then click on the "Trust Selected" button at the bottom.
7. Once the installer is done, click "Launch"
8. There will be another wait while Eclipse loads, so go top up your coffee. There may be nothing visible on the screen while it does this.
9. When it is ready, the workspace will open in a new window.