Well, some people haven't been able to upgrade to Windows 10 yet but here is how you can force the update and enjoy your copy today! Hope you have fun!
Requirements:
- Must have reserved your copy.
- Must be an administrator on the system.
1. Make sure Windows Updates is set to receive updates automatically.
2. Delete everything in this folder: C:\Windows\SoftwareDistribution\Download
3. Run command prompt (cmd.exe) with administrator permissions.
4. Type this command: wuauclt.exe /updatenow
5. Hit enter and then go check Windows Updates
If it doesn't work right away check back in a minute or two.