You can contact support here.
https://azureforeducation.microsoft.com/en-us/institutions/contact
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I took a windows 10 key in 2016 from dreamspark. It's closed. So how can get that key again?
You can contact support here.
https://azureforeducation.microsoft.com/en-us/institutions/contact
--please don't forget to Accept as answer if the reply is helpful--
@Elif SEVGİ
Hi,
Microsoft rebranded DreamSpark as “Microsoft Imagine” in 2016- web links will redirect you to the new site and logins haven’t changed.
https://www.microsoft.com/en-cy/imagine
On the page find the appropriate order in your Order History and click on the adjacent “View Details” link
The next page will show your Product Key which is required for activation.
Hope above information can help you.
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DreamSpark is program part of your University or Education institute and you will need to check with the administrator of your academic institute.