Windows 10: upgrade back to window 10 after crash?

my computer couldnt boot after a migration so, after a lot of trouble I installed windows 7 ultimate on my new disk. I still have the windows 10 disk with all of the data I just cant boot from that disk anymore.
is there anyway of getting back my windows 10 instalation or reinstalling windows 10?
BTW this all hapened 4 days after the free upgrade ended so I could not have used the free upgrade.


EDIT

I installed windows 10 as it was before using the windows 10 update tool(MediaCreationToolx64.exe - Google Drive)
It automaticly used my windows 7 key and it worked, no guarantee it wil work in the future.

:)

 

After revert back to window 8.1 , can i still upgrade to window 10 again??

Hi



Thank you for posting your query in Microsoft Community.



Yes, you can still upgrade to Windows 10 after rollback.



Refer the article How to: upgrade from previous versions of Windows using Windows 10 ISO file
created by Andre Da Costa.

How to: Upgrade from Previous Versions of Windows Using Windows 10 ISO file



Also, refer: How to download official Windows 10 ISO files.

How to Download Official Windows 10 ISO files Using Media Creation Tool or Directly Using your Web Browser



Hope it helps.



Let us know if you have any further query on Windows, we are glad to asist you.

 

After revert back to window 8.1 , can i still upgrade to window 10 again??

I have some problem after upgrade to window 10 . So if I revert back to window 8.1 , can I upgrade again to window 10??

 

Sorry the free upgrade has finished you will need to purchase a copy of Windows 10 unless you can persuade Microsoft otherwise ...

Mircosoft still offer installation options such as ISO files - If you activated your windows 10 on your hardware use the ISO or USB stick to install it will activate automatically

Windows 10 ISO Download - Windows 10 Forums