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QuickBooks Error Code 176109 Invalid Product Number

How to Fix the Invalid Product Number Error in QuickBooks 
QuickBooks is by a wide margin the most famous programming based bookkeeping and accounting arrangement in the business. It is easy to understand without yielding the great highlights that bookkeeping experts love to such an extent. QuickBooks was the product instrument that initially made bookkeeping and monetary administration assignments simple to oversee for people at home. What's more, even today, for little to medium organizations, QuickBooks remains the best programming instrument accessible. 
The far reaching prevalence of QuickBooks programming implies that regular issues and errors get wide consideration. A standout amongst the most widely recognized programming errors QuickBooks clients confront is the "Invalid Product Number" error, regularly alongside an error code "176109". So what is this error and for what reason does this happen? 
This error and the going with code implies that some key confirmation documents have either gotten defiled or are missing, driving QuickBooks to hurl that error. Moreover, as a result of the manner in which QuickBooks works, it additionally requires chairman level consents to peruse and compose information to hard drives and framework parcels with no limitations. On the off chance that these authorizations are not accessible to QuickBooks, the outcome might be QuickBooks error code 176109. 
An invalid or off base item key or item code has been utilized to introduce that specific duplicate of QuickBooks Point of Sale for Desktop. 
The substance of the "Purpose of Sale Entitlement" envelope have been tainted or is feeling the loss of certain key records 
The client account working QuickBooks does not have Administrator level access or the imperative read and compose authorizations on Windows. 
Step by step instructions to FIX INVALID PRODUCT CODE ERROR 
There are two conceivable answers for settle this error. A portion of this require extra authorizations, so in the event that you don't know of what you are doing, contact your framework overseer for direction. Erroneous control of item establishment documents can render your QuickBooks establishment unusable. Continue with alert.

Method 1: Clear the contents of the “Point of Sale Entitlement” folder

Open Windows Explorer and go to the following folder as per the following path:
C:\Program Data\Intuit\Entitlement Client\v8
Ensure that you are not actually running QuickBooks software in the background. Exit all open applications.
Select all the content, files as well as subfolders, in the folder and press Delete. Confirm your action if prompted by Windows.
You are all done. Relaunch the QuickBooks Point of Sale Desktop software and re-enter your credentials to register the application again. Make sure you have a working internet connection.
If error persists, move to Method 2.
Method 2: Change the name of the WSActivity file

Open Windows Explorer and go to the following folder as per the following path:
C:\Program Data\Intuit\QuickBooks Point of Sale XX\Ini
Ensure that you are not running QuickBooks software in the background. Exit all open applications.
Select the WSActivity folder and press F2 button or Right click on it and select Rename.
Rename the folder to OldWSActivity and press Enter.
Now perform the steps outlined in Method 1 again.
Your error should now be fixed. If you continue to get the “INVALID PRODUCT CODE” error, you can try to reinstall QuickBooks Point of Sale Desktop or contact QuickBooks Support Number.

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