KB5001330 Windows 10 Insider Beta 19043.928 21H1 and RP 19042.928 20H2 Insider

Installed smoothly on Beta channel machine and 3 non-Insider machines already upgraded to 21H1. No problems on any of them so far.

Finished rather quickly... left me with winver "Version 20H2 (OS Build 19042.928)"

For anyone (like me) who has been having unresolved issues with the last few months of CU's failing to install with errors such as:

(0x8007000d)

Here's a potential fix that may help others.
After spending multiple days troubleshooting this issue, the problem was actually caused by a WMR (Holographic Desktop) update that was first pushed late January 2021.
Running this DISM command then restarting your PC will resolve, and the CU should install without issue:

dism /online /remove-capability /capabilityname:Analog.Holographic.Desktop~~~~0.0.1.0

Ghot said:

I know. I WAS kind of amazed that it over wrote or re-installed the enablement package, which I had already installed about a month ago.

Mine didn't, I still have the enablement package installed, dated March 26th

Ghot said:

Seems I got KB5000736 (the first time) from UUP Dump on March 1st.
MS must have decided they didn't like the one from UUP Dump or that I shouldn't have a record of it.

Mine shows installed on March 26th, but I did a UUP install on March 31st. Afterwards it downloaded the feature pack, but still shows the same date