Microsoft has started releasing the official ISO images for Windows 10 Insider Preview for both Fast and Slow rings. The company used to share Slow Ring ISO images only, but this has finally changed.
At the moment of this writing, Microsoft offers the following ISO images of Windows 10 Insider Preview:
- Fast Ring - build 18912
- Slow Ring - build 18343
- Fast Ring Enterprise Edition - 18912
- Slow Ring Enterprise Edition - 18343
- Fast Ring Home China - 18912
- Slow Ring Home China - 18343
To grab the ISOs, sign in with your Windows Insider account on the following page.
You will be able to download the files.
Also, see these articles:
- Hidden Features in Windows 10 Build 18912
- Two more hidden features in Windows 10 build 18912
- Windows 10 Build 18912 (20H1, Fast Ring)
- Activate Hidden Features in Windows 10 Insider Builds