Product Download Purchase Support Deals Online Solution  Cart  Sign In

ezPaycheck Payroll Software: Invalid Key Code Issue

When you run ezPaycheck payroll software trial version, you will see key code pop up screen. Once you enter the key code, this pop up screen will not display again. To deposit the checks, you need to register the license code to print checks without TRIAL watermarks.

In this guide, you will find:

  • How to register license
  • "Invalid key code" issue & solution
  • How to purchase/retrieve the license
  • How to update or rollback ezPaycheck

  • ezPaycheck License Key Issue and Solution

    Error code Error description Solution
    4 or 9 Wrong key code Please view #1, #2, #3 in this guide

    If you lost license, please follow this guide to retrieve your license.

    6 This key code has already registered on another computer. 1)If you need to switch computer, please follow up this guide to transfer license from the old computer to a new one.

    2)If you purchase a new computer, please contact us and purchase extra license.

    3) If your computer is crashed, please follow this guide to reset license for a new computer.

    12, 15, 16 or 17 1)Transaction failed.
    2)Or the buyer cancelled the order.
    3)Or the buyer switched/updated the order.
    If you switched/updated order, our system will send you a new key code. Please contact us if you did not receive it.
      Permission issue Please scroll down and view #4 solution
      Insufficient Privileges to install license Please scroll down and view #5 solution

    #1: You entered the wrong license key or installed the wrong software *****

    The license codes of different version are different. For example: you will receive "Invalid license key" error if you enter 2017 key to ezPaycheck 2018 version.

    1.1 You can find version information of the software installed on your computer
    about ezPaycheck

    1.2 You can find the version you purchased from the license message
    ezPaycheck license

    ezPaycheck license

    1.3 Solution
  • If you installed the wrong software, you can install ezPaycheck at

  • If you installed the latest version by mistake, you can rollback to the previous version by following this guide

  • If you purchased the previous version and like to purchase the latest version, you can purchase the new license key at

  • #2: You need to copy and paste keycode including dashes("-")

    Some mail server may also add extra hidden characters around key code. You can copy the key code to NotePad, then copy it to ezPayCheck application to solve this issue.

    How to copy and paste
    Double-click on the text you want to copy, or highlight it. With the text highlighted, press Ctrl + C to copy. Move your cursor to the appropriate location and press Ctrl + V to paste

    #3: Some email server may add hidden characters around key code.

  • Start Notepad by clicking the Start button. In the search box, type Notepad, and then, in the list of results, click Notepad.

  • Open Notepad application, copy the license key from email to the NotePad.

  • Copy the key code from NotePad to your application to register it.

  • This process will remove the unseen charaters added to the key code by your email server.

    #4: Permission issue

    Please refer to this guide What permissions I need to run ezPaycheck correctly

    #5: Insufficient Privileges to install license

    about ezPaycheck

    Such an error may occur when some Windows component is busy.

    1) power off your computer
    2) wait for 60 seconds
    3) restart computer
    4) Start ezPaycheck and try again.

    Still need assistance?

    Please contact us with more details at (If you can't receive our response in 24 hours, your message may be blocked into JUNK folder by mistake. Please feel free to contact us again. )

    1) Software name and version number? (ie: ezPaycheck 2022, version 3.12.5)
    You can click the software top menu "help" then "About ezPaycheck" to view it.

    2) Your key code?

    3) Your computer: Windows 11, 10, 8, 7 or Mac or others?

    4) The error code and error description?

    How to purchase/retrieve the license

  • If you are a new customer or if you are a previous customer (ie: You purchased ezPaycheck previous version and need the new license for current version), you can purchase license from our site.

  • purchase payroll software now

  • If you lost your license (ie: You purchased ezPaycheck 2017 license and cannot find 2017 license):

  • - Please search your email account for the license key message from "".

    - If you cannot find the license message from your email account, please contact us to resend it..

    How to update or rollback ezPaycheck

  • How to update ezPaycheck
  • How to rollback to previous version if I installed the new edition my mistake

  • payroll software

    ezPaycheck Makes 2024 Payroll An Easy, In-House Task!

    (For Windows and Mac)

  • Trusted by Thousands for Two decades.
  • Calculate Federal & State Taxes, Print Paychecks, Print W2, W3, 941, 943 and 940.
  • User-friendly, Easy-to-use
  • No monthly fee. No hidden cost.

  • Try it free for 30 days with no obligation. No credit card required.


    Related Links:

  • ezPaycheck Quick Start Guide

  • How a add a new company account

  • How to handle both employees and contractors

  • How to handle restaurant tips

  • How to add a custom deduction and withhold it from each paycheck automatically

  • How to handle local taxes

  • How to handle State Disability Insurance (SDI)

  • How to print paycheck in different formats: check-on-top, check-in-middle, check-at-bottom or 3-per-page

  • How to print paycheck on blank stock

  • How to print paycheck on pre-printed checks

  • How to print paycheck with company logo

  • How to adjust check printing position

  • Sample Paychecks