I cannot update windows since months the update button dosent works

Hello,

Please run Windows Update troubleshooter from Settings app > System > Troubleshoot > Additional troubleshooters. See if it works.

If that doesn't work, try this:

Open administrative Command Prompt and type following commands one-by-one followed by Enter key.

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver

Close Command Prompt and see if Windows Updates works then.

Let us know if this helps!