Windows 10 May 2020 update is now available

Kapil give good instructions how to use ISO in in-place upgrade, try it first.

If that doesn't work then there is another things to try, but now you have ISO downloaded and you don't need to load again on each attempt.

Some things you can try:

On File Explorer

  Delete content of folder  C:\Windows\SoftwareDistribution\Download

Open Command Prompt (CMD) As Admin and run commands to check system files:

  sfc /scannow

  DISM /Online /Cleanup-Image /RestoreHealth

Check known issues list. Conexant audio drivers has known to cause update issues.

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

Uninstall any 3rd part AV program (if installed) using manufacturer uninstall tool.

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?

I did not try kapli's method

upgrade windows option did not work at all...

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?

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?

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)