Learn how to fix Error 1646: installing quickbooks.msi uninstallation of the update package is not supported:

If you have stopped by this post, then you might be definitely facing the Error 1646 installing quickbooks.msi uninstallation of the update package is not supported. This prompt often appears on the screen, when the user tries to install QuickBooks desktop premier on a system that is having QuickBooks desktop pro of the same year already installed. Not only this, but this sort of error can also be encountered while installing QB accountant on a system that already has a premier version installed that too of the same year. As the error message itself sounds pretty annoying, so is the error:

QuickBooks error 1646 -  Screenshot
Error 1646 installing quickbooks.msi uninstallation of the update package is not supported

So, here we are with the most relevant solution to this error. Make sure that you read this thread till the end. Or else, if you are short of time, you can simply give us a call at 1-800-761-1787, and ask our professionals to fix the error on your behalf. Our QuickBooks error support team will be happy to help you.

Read this also: Resolve QuickBooks error code 12029

Steps to resolve QuickBooks error 1646

The user can simply carry out the clean install tool to resolve the QuickBooks error 1646. A clean install won’t affect the accounting data since the company file and everything it holds aren’t involved at all. The steps involved in clean install tool are as follows:

Step 1: Gather the QuickBooks product information

Product Information window - Screenshot
  • The user needs to download the installer for your version of QuickBooks
  • And also have the license number handy
  • Make sure to write down the product year and version

Step 2: Uninstall QuickBooks desktop

  • The user needs to remove QuickBooks by opening the Start menu and then looking for Control panel and opening the same
  • The next step is to select programs and features or uninstall a program
Programs and Features - Screenshot
  • After that, select the version of QuickBooks desktop you are having issues with
  • Moving ahead, the user needs to select the uninstall or change and then remove and also hit next.
Uninstall or Reinstall QuickBooks - Screenshot

Step 3: Rename the QuickBooks desktop installation folders manually

Rename the QuickBooks desktop installation folders - Screenshot

The next step is to manually rename the folders, to reflect the hidden files after that rename the folder location. This can be done by adding .Old at the end of the folder names and that’s it. This action will permit the user to avoid QuickBooks from recognizing the folder at the time when the user will make the new one. Now, move to the last step.

Read it Also: How to Fix QuickBooks Update Error 1625?

Step 4: Reinstalling QuickBooks desktop

Install QuickBooks desktop 2020 - Screenshot

Once the above steps are complete, the user is supposed to reinstall the QuickBooks software and check if the error persists.

Alternate method

Uninstall QuickBooks and manually rename the installation folders

  • At first, the user needs to uninstall QuickBooks
  • And then follow the steps to display hidden files
  • Followed by opening the windows start menu. The user is then required to look for “File explorer” and open the same
  • The user will then have to spot and open the folder that holds QuickBooks company files. This will be the QuickBooks folder in normal cases. The user can find this in any of the below mentioned paths:
    • C:\ProgramData\Intuit\QuickBooks(year)
    • C:\Users\(Current user)\AppData\Local\Intuit\QuickBooks(year)
    • C:\Program Files\Intuit\QuickBooks (year)
    • 64-bit version C:\Program Files (x86)\Intuit\QuickBooks (year)
  • Now, right click the folder and choose rename option
  • The next step is to add the word “old” at the end of the folder name. This will prevent the QuickBooks software from trying to open it when the user reinstalls.
  • Lastly, the user needs to re-install QuickBooks desktop

In case the user identifies an access error message, while trying to rename the folder, then the below steps could help:

  • Initially, the user needs to right click the windows task bar, and also choose the task manager
  • Once done with that, move to the processes tab
  • Followed by opting for name column header to sort the list
  • The next step is to select the following processes and then end process for each: QBDBMgrN.exe, QBDBMgr.exe, QBCFMonitorService.exe, Qbw32.exe
Close QBW32.exe process - Screenshot
  • Towards the end, the user is supposed to select yes, in case an error message is seen stating “WARNING: Terminating a process can cause undesired results..

Also see: Fix validation code is incorrect error in QuickBooks

Well, carrying out the above clean install process might help you in getting rid of QuickBooks error 1646. However, if for any reason this error continues to trouble you, then do not waste time just ring up at 1-800-761-1787, and ask our QuickBooks customer support team to deal with this error on your behalf. Our experts and certified accounting professionals will be happy to help you.


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