Click "Download." Once the installer has finished downloading, locate the downloaded file on your computer and double-click on it to run the installer. Follow the on-screen instructions to begin the installation process. Enter Your License Information: During the installation process, you will be prompted to enter your product key or license number. Make sure to enter this information accurately. If you purchased QuickBooks online, your license information may be associated with your account, and you may not need to enter it manually.