Quickbooks works perfectly on a computer with an uninterrupted power supply. Please ensure that your computer isn't going off unexpectedly too often.

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There are 3 possible reasons you're encountering the Quickbooks Pos Invalid Product number error 176109 and they are as follows

• The POS Entitlement folder contains compromised files.
• An incorrect product code has been used to install QuickBooks Desktop POS.
• You're not logged in to Windows as an admin
• You're using QuickBooks POS on a desktop. Quickbooks encounter this issue when your computer shuts down unexpectedly regularly

To fix this issue, follow the steps below

Solution 1. Delete entitlement folder

Option 1 (Automatic)

1. Download the Clear Entitlement File tool.
2. Unzip the file to your desktop.
3. Double-click to run the file.
4. Re-launch QuickBooks Desktop Point of Sale and complete the registration.

Note: You can delete the Clear entitlement v8.bat file as well as the Clear_entitlement_v8.zip files.

Option 2 (Automatic)

In this step, you'll need to unhide the Entitlement Client folder which is found inside the Program Data folder.

1. On your keyboard, press the Windows key ⊞ + E, to open Windows Explorer.
2. Navigate to C:\Program Data\Intuit\Entitlement Client\v8.
3. Press Ctrl + A on your keyboard to select all the files in the folder, then press Delete.
4. Select Yes to confirm the action.
5. Re-launch QuickBooks Desktop Point of Sale and complete the registration.

If the issue isn't resolved, Send a WhatsApp message to +1 (315) 284-1484 to verify the correct validation code is being used.

Solution 2. Uninstall Quickbooks Enterprise

Please not that if you have quickbooks enterprise installed, you may need to uninstall it

1. Uninstall QuickBooks Enterprise (any version)
2. Restart your computer
3. Install QuickBooks Point Of Sales
4. Install Quickbooks Enterprise

Solution 3. Rename the WSActivity file

1. On your keyboard, press the Windows key ⊞ + E, to open Windows Explorer.
2. Navigate to C:\Program Data\Intuit\QuickBooks Point of Sale XX\Ini.
3. Right-click WSActivity and select Rename.
4. Enter “OLDWSActivity” and click anywhere to save.
5. Close the window, then follow Solution 1 to delete the contents of the entitlement client folder again.
6. Relaunch QuickBooks Desktop Point of Sale.

Solution 4. Install Quickbooks Point Of Sales On A Laptop

This solution might seem unexpected but QuickBooks works perfectly when there is an uninterrupted power supply.