Update: Added links and images where possible. I know this is a random site so you dont have to trust the links here, make sure you download from the official sources. I wanted a clean version of windows to install on a proxmox just for some testing but the offial version is so bloaty and full of rubbish i wanted a way to strip it down and remove most of the crap.

So here are the instructions:

Creating a customized, streamlined version of Windows 11 is easier than you might think. By using a builder script with an official Windows image, you can strip away unnecessary bloatware and bypass restrictive installation requirements. The process takes roughly 30 minutes and requires no advanced technical skills.

What You Need Before Starting

• A pristine Windows 11 ISO: Visit the Microsoft website to download the official Windows 11 Disk Image for x64 devices. Make sure to select the latest version available, such as 25H2.
  
  https://www.microsoft.com/en-us/software-download/windows11 
  
  
  
  
• The builder script: Head over to the Tiny11Builder GitHub page by ntdevlabs and download the most recent .zip release.
• A dedicated workspace: Create a new folder on your computer named C:\Builder and extract the contents of the script's .zip file directly into it. Keeping your files organized will prevent headaches later.

Step-by-Step ISO Creation

1. Mount the Windows Image: Locate your downloaded official Windows 11 ISO. Right-click the file and select Mount. Note the new drive letter Windows assigns to it, such as D: or E:.
2. Open PowerShell with Admin Rights: Open your Start menu, type PowerShell, right-click the application, and choose Run as administrator. Administrator privileges are strictly required for this to work.
3. Adjust Execution Policies Temporarily: Before running the script, you must permit PowerShell to execute it. To keep your system secure, apply a temporary bypass that only affects your current session by typing the following command and pressing Enter: Set-ExecutionPolicy Bypass -Scope Process. When prompted, type A to confirm Yes to All.
4. Execute the Builder Script: Navigate to your workspace folder by typing cd C:\Builder and hitting Enter. Next, start the script by typing & ".\tiny11maker.ps1" and pressing Enter. Include the ampersand and quotation marks exactly as shown.
5. Answer the Prompts: The script will ask for the drive letter of your mounted ISO. Type it in and press Enter. It will then display a list of Windows editions. Choose the number corresponding to your preferred edition, which is typically 6 for Windows 11 Pro, and hit Enter.
6. Let It Process: The script will now remove the bloatware and generate a clean ISO. This process generally takes between 10 and 20 minutes. Feel free to step away while it works.
7. Locate Your New File: Once finished, check your C:\Builder folder. You will find a new file named tiny11.iso. Because you built this yourself from an official source, it remains capable of receiving standard Windows security updates.

Creating the Installation Media

Now that your custom ISO is ready, you need to write it to a bootable USB flash drive using a utility called Rufus.

1. Download the latest version of Rufus from rufus.ie.
2. Insert a USB flash drive with at least 8GB of storage space. Be aware that all existing data on this drive will be permanently erased.
3. Open Rufus and select your USB drive from the Device dropdown menu at the top.
4. Click the SELECT button next to Boot selection and locate your newly created tiny11.iso file.
5. Leave the Partition scheme set to GPT.
6. Click START.

Bypassing Installation Restrictions

After clicking START, Rufus will present a Windows User Experience menu. This menu allows you to bypass several common Windows 11 installation hurdles. Ensure the following options are checked:

• Remove requirement for Secure Boot and TPM 2.0: This permits installation on older hardware that Microsoft officially considers unsupported.
• Remove requirement for an online Microsoft account: This enables you to create a standard local account instead of being forced into cloud synchronization.
• Disable data collection: This automatically declines the privacy and telemetry prompts during the final Windows setup phase.
• Set a local account using this name: You can optionally provide your preferred username here to speed up the installation process.

Click OK to proceed. Rufus will issue a final warning about erasing the USB drive. Confirm the warning, and wait for the status bar to read READY.

Your custom, privacy-focused Windows 11 installation drive is now complete. Simply boot your target PC from this USB drive and install the operating system.