Based on the text, it seems like there are two different topics discussed: ElevenClock for Windows and installing iOS 11.4 on an iPhone or iPad.

For ElevenClock:

* The tool allows users to customize the clock that appears on their PC screen if they have Windows 11.

* You can download the latest version of ElevenClock from the link provided ('{key}').

* To install, follow these steps:

1. Run the executable file after downloading.

2. If prompted with a 'Windows protected your PC' message, click on 'More info', accept the license agreement, and then click 'Next'.

For installing iOS 11.4 on an iPhone or iPad:

* Open the Settings app on the device.

* Go to General > Software Update.

* When iOS 11.4 becomes visible, choose 'Download & Install'.

* The update will download and install, and the device will reboot itself to complete the process.

Please note that these instructions are specific to installing ElevenClock for Windows and updating an iPhone or iPad to iOS 11.4. If you have any questions or need further clarification, feel free to ask!

For iphone download ElevenClock 4.3.0