HP Smart for Windows is an application from the Microsoft Store. Even if the application were to have been updated, there is "no going back" - Microsoft Store does not keep old versions around and HP would not open their vault to bypass the approved method to gain access to the application.
If you have a Restore Point saved that was created prior to the change, you might be able to get back the old / previous setup using System Restore. This is not a "given" - unless you create Restore Points on occasion, the one you need (if you have any of these at all) is not likely available.
If the software / application to which you refer is something for which you have previously downloaded and saved the installation file, that older / previous file might still be in your Downloads folder. You could try removing the software / application you don't like and installing the version you do like.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".