For years, the best way to quickly export a business document or any other file to PDF format was via Adobe Acrobat's PDF Printer. It's a free, easy-to-use software program. If you no longer have access to Adobe in your list of printers, don't worry. In most cases, you can get it back by either repairing the software or reinstalling the PDF printer. The errors you get can vary, such as Adobe Reader not showing printer, or that you're missing the Adobe Printer Driver, or even that the documents' *.PDF port is missing from printer list. However the solution is the same for each.
Before fixing the problem, if you use a Mac computer or a Windows 10 PC, you should know that you don't need Adobe to print to a PDF file. This is a feature that already comes built into your computer.
Windows 10 has a built-in option for printing files to PDF documents that doesn't require any other software. Open the document or file that you want to print and then press "Ctrl-P" or select Print from the File menu. Click the currently-selected printer from the Print dialog box and then change it to "Microsoft Print to PDF." Windows then gives you the option to type a name for the PDF document and to select a destination folder before you click "Save."