When done, remove the locally stored settings. Press the Windows key (⊞) on your keyboard, or select the Start icon on your screen, and from the search bar enter %appdata% (including the percentage signs). Hit Enter.
Find the QuickBooks folder. If you see a Roaming folder instead, open it first as the QuickBooks folder is contained within. Right-click and Delete the QuickBooks folder. This will be recreated when a fresh version of the app is installed.
Using the article in Step 1, go to the How do I install the app? sectionto re-install the QBO app based on the method for your Windows version. Also, it's recommended that you allow the program to be stored in the default installation directory (usually C:/ProgramFiles or ProgramFiles (x86)).
Also, you can always sign in to your QuickBooks Self-Employed (QBSE) account using a web browser.