UPDATE 6/11: KB5004476 Windows 10 2004 19041.1055, 20H2 19042.1055, 21H1 19043.1055
The KB4562830 Enablement Package allows you to go from build 19041 (v2004) to 19042 (v20H2).
The KB5000736 Enablement Package allows you to go from build...
UPDATE 6/17: KB5003690 W10 Insider Beta 19043.1081 21H1 and RP 19042.1081 20H2
The KB5000736 Enablement Package allows you to go from build 19042 (v20H2) to 19043 (v21H1).
Source: Releasing Windows 10 Build 19043.1052 (21H1) to Beta &...
UPDATE 6/8: KB5003637 Windows 10 2004 19041.1052, 20H2 19042.1052, 21H1 19043.1052
The KB4562830 Enablement Package allows you to go from build 19041 (v2004) to 19042 (v20H2).
The KB5000736 Enablement Package allows you to go from build...
UPDATE 5/25: KB5003214 Windows 10 2004 19041.1023, 20H2 19042.1023, 21H1 19043.1023
The KB4562830 Enablement Package allows you to go from build 19041 (v2004) to 19042 (v20H2).
The KB5000736 Enablement Package allows you to go from build...
UPDATE 4/28: KB5001391 Windows 10 Insider Beta 19043.964 21H1 and RP 19042.964 20H2
The KB5000736 Enablement Package allows you to go from build 19042 (v20H2) to 19043 (v21H1).
Source: Releasing Windows 10 Build 19043.962 (21H1) to...