https://wccftech.com/download-windows-10-iso-18343-19h1/

Microsoft seems to be having one busy day. The company just opened some slots for Insiders to play State of Decay for free, released a new Insider Preview build of the upcoming Windows 10 version 1903, and is now also making ISOs available.

The Windows maker has now made available the ISOs for the upcoming Windows 10 version, but they aren’t from today’s build. ISOs are now available for Windows 10 1903 build 18343, which was released last month to the Fast ring Insiders and last week for the Slow ring Insiders. The company clarified that both builds 18342.8 and 18343 have the same content and carry “slightly different” build numbers, which is an “intentional difference due to media creation.”