I tried to manually resize the partition by 250 MB per the instructions here:
https://support.microsoft.com/en-us/topic/kb5028997-instructions-to-manually-resize-your-partition-to-install-the-winre-update-400faa27-9343-461c-ada9-24c8229763bf#articleFooterSupportBridge=communityBridge
I had to exit Disk Part because I can not shrink the OS partition first:
Microsoft Windows [Version 10.0.19045.3930]
(c) Microsoft Corporation. All rights reserved.
C:\WINDOWS\system32>reagentc /info
Windows Recovery Environment (Windows RE) and system reset configuration
Information:
Windows RE status: Enabled
Windows RE location: \\?\GLOBALROOT\device\harddisk0\partition4\Recovery\WindowsRE
Boot Configuration Data (BCD) identifier: 610c3ed8-af74-11ee-92f0-acd56448675c
Recovery image location:
Recovery image index: 0
Custom image location:
Custom image index: 0
REAGENTC.EXE: Operation Successful.
C:\WINDOWS\system32>reagentc /disable
REAGENTC.EXE: Operation Successful.
C:\WINDOWS\system32>diskpart
Microsoft DiskPart version 10.0.19041.3636
Copyright (C) Microsoft Corporation.
DISKPART> list disk
Disk ### Status Size Free Dyn Gpt
Disk 0 Online 119 GB 11 MB *
DISKPART> sel disk 0
Disk 0 is now the selected disk.
DISKPART> list part
Partition ### Type Size Offset
Partition 1 System 750 MB 1024 KB
Partition 2 Reserved 128 MB 751 MB
Partition 3 Primary 117 GB 879 MB
Partition 4 Recovery 1022 MB 118 GB
DISKPART> sel part 1
Partition 1 is now the selected partition.
DISKPART> shrink desired=250 minimum=250
You may not shrink OEM, ESP, or recovery partitions, or, offline volumes.
The volume you have selected may not be shrunk.
Please select another volume and try again.
DISKPART> list part
* Partition 1 System 750 MB 1024 KB
Partition 2 Reserved 128 MB 751 MB
Partition 3 Primary 117 GB 879 MB
Partition 4 Recovery 1022 MB 118 GB
DISKPART> exit
Leaving DiskPart...
C:\WINDOWS\system32>reagentc /enable
REAGENTC.EXE: Operation Successful.
C:\WINDOWS\system32>reagentc /info
Windows Recovery Environment (Windows RE) and system reset configuration
Information:
Windows RE status: Enabled
Windows RE location: \\?\GLOBALROOT\device\harddisk0\partition4\Recovery\WindowsRE
Boot Configuration Data (BCD) identifier: 610c3eda-af74-11ee-92f0-acd56448675c
Recovery image location:
Recovery image index: 0
Custom image location:
Custom image index: 0
REAGENTC.EXE: Operation Successful.
C:\WINDOWS\system32>
Is there another way to install this update?