Windows 10 May 2020 update is now available

What’s new in the Windows 10 May 2020 Update

https://blogs.windows.com/windowsexperience/2020/05/27/whats-new-in-the-windows-10-may-2020-update/

How to get the Windows 10 May 2020 Update

https://blogs.windows.com/windowsexperience/2020/05/27/how-to-get-the-windows-10-may-2020-update/

Known Issues:

Windows 10, version 2004 and Windows Server, version 2004

https://docs.microsoft.com/en-us/windows/release-information/status-windows-10-2004

I have 14.5 GB free on local disk c  

I have tried 2 times to install update on my

update reaches 60% then strangely it returns to 57% then it reaches to 71%

after that a message says "undoing changes to your computer"

Is low disk storage the reason why the update does not install properly on my computer

you need minimum 30GB free space

That disk space should be enough as as shown in these 4 screenshots. You have some other issues.

1. Before running MCT on 18363 (Free space 14.79 GB)
2. MCT is asking to Install (Free space 10.22 GB)
3. Installing in 95% and almost ready to restart (Free space 9,43 GB)
4. Upgrade completed (Free space 13.15 GB without disk cleanup)

Help! I used Media Creation tool to upgrade to full version and i pressed upgrade windows and keep files and programs after it finished and i restarted my computer the same version 2004 working on updates screen appeared .. i have seen this screen 2 times when i tried to update 2 times and it did not work.. will it work?

Thats just like I have done on 3 pc. Run MCT, selet upgrade this PC, keep apps and filed.

Did you try Kapil's advice on your another thread?