QuickBooks update error 15106is a typical issue that affects ECML files. When the system is unable to remember the licensing data file, the system becomes unstable and unsteady. This error could arise as a result of an unintended or faulty system shutdown. Talking about this nuisance issue, users see it majorly while updating the program. It generally covers your screen with loads of pop-ups messages making users stop their crucial work. The QuickBooks update error 15106 implies that there is a damaged update program and the payroll fails to update.