Microsoft today released new ISO images for its Windows 10 20H1 previews. The ISOs for build 18950 replace the ones for build 18932, which were released four weeks ago. Obviously, these can be used for a clean installation of Windows 10 20H1.
20H1 is the codename for the feature update to Windows 10 that will be released in the first half of 2020. There's going to be another, smaller update that comes before that though. 19H2 is slated for this fall, and that's currently being tested in the Slow ring.
There are still no 19H2 ISOs available yet though, even though a couple of months ago, Microsoft actually split the ISO dropdown into Fast ring and Slow ring sections. Those should be on the way pretty soon.
If you want to download the ISO image for Windows 10 Insider Preview build 18950, you can find it here. As usual, your options for download are the Windows 10 Insider Preview, Windows 10 Enterprise, and Windows 10 Home China. They're only available in x86 and AMD64 flavors.