It is important to note that Windows 10 Build 15035 was a "Redstone 2" (RS2) release, which corresponds to the Windows 10 Creators Update (Version 1703).
This is the most common tool used by enthusiasts to "build" ISOs for specific Windows builds. It fetches files directly from Microsoft's Windows Update servers and packages them into a bootable format. Archive.org: windows 10 build 15035 media builder link