How to fix & repair this error in QuickBooks desktop. QuickBooks Error Code -20. QuickBooks Printer not activated Error Code 20 is the result of Upgrade to Windows 10, Or you are trying to print from QuickBooks 2009 installed on a Windows 10 Computer. QuickBooks Error Code 20 is one such problem. It is a kind of issue that arises when the user is attempting to print a document or invoice. Error Code -20 “QuickBooks PDF Converter Activation Error -20” Know More information dial 1-800-993-4190 Read More Also 99Accounting.