Today is the BIG day, you can claim your Windows 10 copy for free.
But as all things Microsoft something goes wrong when downloading the files and you end up with a error lie this one:
Fix WindowsUpdate_80240020 Error
There is a simple fix for this (not so simple for me since I am on my 5th try) that users reporting that solves the issue.
This error occurs due to the downloaded package now being complete, so the workaround is to delete your downloaded data and then issue a command to re-start the download.
Here are the steps:
1) Access this file location C:\Windows\SoftwareDistribution\Download and delete everything there. (Note delete only content found there and not the Download folder itself)
2) Open CMD (command prompt) with run as administrator (admin privileges) and run this command: wuauclt.exe /updatenow
The Update Window should pop-up with downloading Windows 10 again, and if your lucky it will be the complete kit this time.