Will there be supp for win7 in future? Or do I really need to upgrade my Windows to play this? 
Hi:
I assume this is for Diablo II: Resurrected.
I doubt very much that Windows 7 support will be provided since Windows 7 is no longer supported by Microsoft (since January 2020).
Please find the system requirement to run D2R:
Also, the forums here are for the technical support of Classic Games such as Diablo II(2000), StarCraft, etc…
Please be aware that there are new dedicated forums for D2R; they are available here:
US region, English:
EU region, English:
You may want to bookmark those.
Regards.
Do know that while you wont get official support if you do get it.
I have found it runs fine on my Win 7 service pack 1 system.
Though any bugs you might encounter are of course at your own risk.