UPDATED 5/21: Although Microsoft is officially launching Windows 10 version 1903, May 2019 Update, towards the end of May, starting on April 18, 2019, the company is making the new Windows 10 ISO files available through the Microsoft Developer Network (MSDN) (via ZDnet).
If you’re unfamiliar, MSDN is a subscription-based service aimed for developers, testers, and network administrators.
In the case that you happen to have a subscription, starting immediately, you can download the ISO files for the consumer version of the Windows 10 May 2019 Update as well as the server version of the operating system to perform an in-place upgrade or a clean installation with the latest feature update.
Update May 21, 2019: If you don’t have a MSDN subscription, you can now download the Windows 10 version 1903 ISO file using these steps.
How to download Windows 10 version 1903 ISO using MSDN
To download the Windows 10 ISO directly to the service, use these steps:
Warning: If you get the “This PC can’t be upgraded to Windows 10” error message is because your device has a USB external storage or SD card attached and Microsoft is blocking the update. To successfully upgrade your device, remove any external storage (except the one with the installation files), and then restart the May 2019 Update again.
Open the MSDN portal.
Sign-in with your subscription credentials.
Click the Download tab.
Search for Windows 10 (consumer editions), version 1903.
Click the Download button.
After you complete the steps, you can double-click the file to mount the ISO, and running the Setup.exe file will start the in-place upgrade process.
Windows 10 version 1903, May 2019 Update, ISO details
Alternatively, you can use third-party tools like Rufus to create a bootable media to start your device to perform a clean installation of Windows 10 with the latest feature update.
Once you install the May 2019 Update, you can start taking advantage of the new features, including the new light mode. The ability to insert symbols using the emoji panel. Windows Sandbox to test untrusted applications. The new enhanced search feature, and lot more. You can check everything that’s coming in this new feature update in this extensive guide.