When you try to install, update, or remove QuickBooks using a Microsoft Installer (.msi) file, you may encounter QuickBooks problem 1646. This error message notifies, "Error 1646: Uninstallation of the update package is not supported."

This error usually happens due to;

• Missing registry entries
• Permission restrictions
• Conflicts with antivirus software
• Damaged or incompatible installer file

Additionally, you may experience unexpected crashes, messages referencing .msi issues, and update failures during the installation process.

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Possible Factors that Led to the QuickBooks Error 1646

Error 1646 is very frustrating for you as it impacts the tasks. Before fixing the error, you first need to know what its causes are. Below, we have provided information that includes:

• The installation process might not receive the permissions
• Might face a problem in opening the QB file on your computer
• Your system will crash whenever you try to open QBs
• Might face slow performance of the system
• Using an outdated version of Windows OS
• The Windows temporary folder is full

How to Resolve QuickBooks Error 1646 on your Desktop?

To get rid of QB error code 1646, you will need to go through specific steps to rectify the issue with the justification procedure as mentioned below:

Solution 1: Check the QBDT software's product details

• Start the QuickBooks Desktop Software first.
• Then press the keyboard's F2 key. The product information window will appear in front of you as a result.
• You will find all the necessary product information in this window
• Lastly, make a detailed note of every detail, including the product key and license number.
• Additionally, don't forget to record the product's version and year.

Solution 2: QuickBooks Desktop Software uninstallation

• Click the Control Panel after selecting the START menu, or type Control into the search bar and double-click the Control Panel to open it.
• Next, choose Programs and Features. You can also click on a program to choose to uninstall it.
• Then choose your QuickBooks Desktop version
• Click Uninstall or Change now, and then select Remove
• Lastly, press the Next button.

Solution 3: Rename the installation folders for QuickBooks Desktop

• The QuickBooks Desktop installation folder can be right-clicked.
• At the end of the folder name, add .old
• QuickBooks is forced to create a new folder because it is unable to access the renamed one.

Solution 4: Reinstall QuickBooks Desktop

• From the Start menu, select the Control Panel
• Select Features and Programs
• Choose QuickBooks after finding it in the list
• Select Uninstall after clicking Uninstall/Change
• Await the completion of the uninstallation
• Give your machine a restart
• Utilizing your product and licensing keys, reinstall QuickBooks
• To finish the installation, adhere to the on-screen directions
• To see whether the problem has been fixed, open QuickBooks

Also Read: Quick Techniques to Resolve QuickBooks Company File Error 6010 100

Conclusion After completing all the actions mentioned above, if QuickBooks error code 1646 continues to cause you problems, we strongly advise you to contact our dedicated QuickBooks team at TFN +1 (855)-955-1942. They will provide you with the support services you need to resolve this problem as quickly as possible.