Where can I get a clean ISO of a specific build of Windows 10?

Microsoft is no longer providing the clean ISOs (with proper Boot.wim and Install.wim and not ESD files so that you can use DISM to serve them) on a website.

But some users were able to find a way to generate download links.

• open this website
• under Select type: select Windows (Final)
• under Select version: select Windows 10 Version 1607, Redstone1 [Jul2016]
• under Select edition:select which ISo you want. Most home users want Windows 10 Pro + Home
• select under Select language: your language
• now select if you want 32 or 64Bit ISO:

On the right site you can find now download buttons for the selected ISO.

If you want other ISOs for Windows 10 Creators Update, select Windows 10 Version 1703, Redstone2 [March 2017] - Build 15063.0.

If you want other ISOs for Windows 10 Fall Creators Update, select Windows 10 Version 1709, Redstone3 [September 2017] - Build 16299.15.

If you want ISOs for the Windows 10 April 2018 Update (Version 1803), select Windows 10 Version 1803, Redstone4 [Apr 2018] - Build 17134.1.

Another way to download the ISO file is by using the Media Creation Tool. Download it here. Follow the instructions to download the ISO file of the Anniversary Update.

Personally, I like to use Jan Krohn's Microsoft Windows and Office ISO Download Tool for downloading the ISOs - it is a standalone-tool that will start the requested download from Microsoft's servers. Here is a screenshot of the GUI:

The ISO it provides seems to be the same as the one from the website suggested by magicandre1981 (checked SHA-1).

You can also copy the ISO's link via a button and copy it into a download tool like JDownloader.

The possible disadvantages to this tool are:

• You may need the latest version to find new OS versions,
• It asks for donating idle system resources. However, you can deny that request without drawbacks.