Hi, This is Ramesh.
Please run winver.exe and post a screenshot of that dialog. It shows your OS build info.
If you've recently tried to upgrade to 25H2 and failed, share a zipped copy of the following log files on OneDrive or GoFile.io, and post the link here:
C:\$WINDOWS.~BT\Sources\Panther\setupact.log
C:\$WINDOWS.~BT\Sources\Rollback\setupact.log
The setup logs help me determine why the upgrade failed.