If you’are getting the message, “Hearthstone has been updated. Please download the latest version.”, when you try to install from 25.2.0 to 25.2.2 then you need to restart your computer.
I was searching all over for an answer. I tried uninstalling, scanning for updates, and repair. Restarted pc and as soon as Bnet opened up it started installing the latest version of Hearthstone.
Hope this helps someone.
Cheers!