Microsoft has finally released new ISOs for Windows 10 19H1. Although the company has been releasing new builds for 19H1 almost every week, it has been lacking on the ISO side. In fact, the Slow Ring of the Insider program still does not have any 19H1 build so far.
Microsoft did offer an ISO for a 19H1 build in the past, though that was later removed. The company has now released new ISOs for those willing to test 19H1, allowing them to clean install the new 19H1 builds.
The company released build 18290, which was only released back in late November to Insiders in the Fast Ring. Once again, this build is not available on the Slow Ring, so if you do clean install it you’d either have to get builds from the Fast Ring or simply opt out of the Insider Program if you don’t want to get the newer, albeit buggier builds.