Microsoft has released the latest Windows 10 May 2019 update (version 1903) through the Windows update service for users running earlier versions of Windows 10.
If you want to reinstall Windows 10 for any reason or if you can't wait to get the latest version of Windows 10, you can download the latest version of Windows 10 from Microsoft.
People who have upgraded to Windows 10 may want to perform a clean installation of Windows 10 from the USB drive. If you are one of those users who want to reinstall or clean install Windows 10, you'll be glad to know that you can now easily download Windows 10 ISO for free directly from Microsoft.
Windows 10 ISO download from Microsoft without entering the product key
Step 1 : Visit this Microsoft page: https://www.microsoft.com/en-us/software-download/windows10 and download Media Creation Tool.
After downloading, you get 1 file as shown below.
Step 2 : Open the file MediaCreationTool can be a bit long. If you wait more than 5 minutes but do not see the window shown below, restart your computer and open it again. After opening the file, select Accept
Step 3 : Select Create installation media for another PC and click Next
Step 4 : You will get the following window. If you see the Use the recommended options for this PC deselect as table 1 below, then in the Language (language) if the default value is not English ( United States), do click on it and select it again in English (United States)
In the Edition You have 3 options: Windows 10 Windows 10 Home Single Language and Windows 10 N . You choose Windows 10, because this is the version that includes Windows 10 Home and Windows 10 Pro, when you use this file to install Windows 10 you can choose to install the Home or Pro version.
In Architecture choose the version of the Windows .ISO file you wish to download: 32 bits (x86) or 64-bit (x64) or Both (support the installation of both versions)
You must choose 32 bits or 64 bits not both. Example I choose 32 bits (x86), then select Next to go to the next step.
Step 5 : In “ Choose what media to use ” choose ISO File => Next
Step 6 : Choose a location to save the image file ISO and then click the Save button to start downloading the Windows 10 ISO image file. 
Now the computer will start downloading Microsoft files to your computer. The download time can be 10 to 120 minutes, depending on your Internet speed.
Once the download is complete, you can see the message as shown below, select Finish to complete
Go to the place where you chose to save the file (Example I choose the Desktop Screen) and you will see a Windows file (this file is an iOS file, depending The computer will have different display icons, it is not necessary to extract it) Now you can change the name or move it to any folder you like.
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