I've got the link for you to download the Desktop app for Windows, Datc42.

Please click this link so you can begin the process. Scroll down and click the Free download button under Get the QuickBooks Mac or Windows App. 

Once done, you can immediately see the shortcut icon for QBO on your desktop. Just click it and sign in using your credentials.

Visit the Community if you have more questions. We're here to lend a hand.