Please note, uninstalling Quicken will not impact your Quicken data files. Backing up your file isn't required, but is used as a precautionary step. If you're unable to open Quicken to do so, you can skip this step and continue.
All you need to do is follow the instructions below and Quicken will run the QCleanUI process for you during the installation.
The QCleanUI process is now built into the Subscription Release of Quicken.