Open Control Panel on your Windows system. Click Devices and Printers. In the Devices and Printers window, navigate to the Printers section. Locate Print to PDF, right-click the entry and choose Set as default printer from the menu. Once done, you should see a green checkmark next to Print to PDF, which is set as a default printer. Next, you can attempt to print any file, and since the default printer is a PDF printer, it will automatically ask you to save it as a PDF file on your PC.