Cannot get KB4586781 to install successfully

tpriest said:

As said in the OP my laptop won't update to 2004, I've tried it. Possibly because the CU update mentioned is failing. As dalchina said in post #2 an in-place upgrade repair install may be necessary.

My desktop is ready to go but I've held back, deliberately.

Ok, I am running both on my 2 PC's without any issues ....but my PC's are built a lot different than yours.

Before you resort to the upgrade repair, I would try a clean boot
https://support.microsoft.com/en-gb/...oot-in-windows

I am sure you are familiar with clean boot but please ensure you follow the steps carefully hiding all microsoft services before disabling others



That can sometimes allow the update to version 20H2 to install

tpriest said:

As said in the OP my laptop won't update to 2004, I've tried it. Possibly because the CU update mentioned is failing. As dalchina said in post #2 an in-place upgrade repair install may be necessary.

My desktop is ready to go but I've held back, deliberately.

You need to do an In-Place Upgrade as @dalchina mentioned above...

Repair Install Windows 10 with an In-place Upgrade







Here is the short version of the In-place upgrade tutorial...

DISABLE non-Microsoft:
a) antivirus software
b) firewall software
c) drive encryption software

Make a full OS backup with a program like Macrium Reflect (free)
Macrium Software | Macrium Reflect Free

Go here and get the Media Creation Tool and save it to your desktop.
https://www.microsoft.com/en-us/soft...load/windows10

RUN the Media Creation Tool and use it to: Create an ISO image... save IT to your desktop.
This will be the latest version of the ISO image.

For older ISO image versions, go here instead...
Download Windows 10 ISO File


Right click the ISO image and choose: MOUNT
Open File Explorer and you will see a new drive letter. It will look like a DVD optical drive.
Double click the new drive letter to open it.
Find setup.exe and double click it to start the in-place upgrade.

Choose the Keep personal files and apps option.

After it's all done... to UNmount the ISO image, right click the new drive letter and choose: EJECT.


The ONLY thing you will lose is some of your personalizations. Your programs and data will be intact.