Watch the Video to understand Better :

Method 1: Troubleshoot Windows Update.

1. Click on the Windows icon.
2. Click on Settings.
3. Scroll down and click on Troubleshoot.
4. Click on Other Troubleshooter.
5. Here you'll see Windows Update, click on Run.
6. Once you click on Run, you will get a screen that may ask you to restart your computer.

Method 2: Create a .bat File.

1. Open a Notepad on your Windows 11 PC.
2. Paste the commands (which can be found in the link provided in the video description) into the Notepad.
3. Click on File, then click on Save As.
4. Select the location (Desktop is recommended for easy access).
5. Give the file a name, make sure to add .bat at the end.
6. Click on Save.
7. Once saved, you will see the .bat file on your desktop. Right-click on it and click on Open.

Method 3: Resize Your Partition.

1. Visit the link given in the video description to see all the commands to resize the partition.
2. Open a Command Prompt as an administrator.
3. Type CMD in the search bar, then click on Run as Administrator.
4. Copy and paste all of the commands one by one.
5. Understand which disk has your Windows 11 installed.
6. Select that disk by typing the command sel disk 0 (replace 0 with your disk number).
7. List the partition by typing list part.
8. Select the partition in which the operating system is running and installed.
9. Type the command sel part 4 (replace 4 with your partition number).
10. Copy and paste the next command.
11. Understand the difference between GPT drive and MBR drive.
12. If you have a GPT drive, copy and paste the command provided in the video.
13. If you have an MBR drive, remove the ID and type 27 instead of the ID.
14. After this, type the command GPT attribute.
15. Copy the next command and press Enter.
16. Type list volume and press Enter.
17. Type exit and press Enter.
18. Paste the next command.

 😎  All commands Mention in the Link : https://tezadvise.com/how-to-fix-install-error-0x80070643-windows-11/