Microsoft to begin testing Windows 10 April 2020
install Windows 10 build 18865

Windows 10 build 18865 may trigger GSOD errors

Windows 10 Update
download Windows 10 build 18346

Windows 10 build 18346 is all about bug fixes

Windows 10 Build 18343 bugs
Windows 10 build 18841 issues

Windows 10 build 18841 brings a bunch of browser errors

Windows 10 build 18342
fix pc cover

Download the first Windows 10 20H1 Insider Preview Build