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This guide is provided by Conductor, the service that powers the QuickBooks Desktop integration for many business tools, including the one that sent you here.
Conductor works only when one version of QuickBooks Desktop is installed on the computer that runs the QuickBooks Web Connector. Follow the steps below to remove the others.
You must uninstall every other version of QuickBooks Desktop because having more than one installed causes the QuickBooks Web Connector to crash or fail to connect to QuickBooks Desktop. Follow the steps below to remove them.
1

Open the Windows Control Panel

Using Windows search (usually located in the bottom-left corner of your screen), search for “Control Panel”, and open it.
2

Click on Programs and Features

In the Control Panel, click on “Programs and Features” or “Uninstall a program” (exact wording may vary depending on your version of Windows).
3

Check for multiple versions of QuickBooks Desktop

In the list of installed programs, look for any versions of QuickBooks Desktop. If you see multiple versions, such as in the example below, continue to the next step. If you only see one version, you can stop here.Do not uninstall the QuickBooks Web Connector or QuickBooks Database Server Manager, which are not versions of QuickBooks Desktop.
4

Close QuickBooks Desktop

Before uninstalling any versions of QuickBooks Desktop, make sure QuickBooks Desktop is completely closed.
5

Uninstall the older version(s) of QuickBooks Desktop

Back in the Control Panel window, right-click on the older version(s) of QuickBooks Desktop in the list of installed programs and click “Uninstall”. Follow the prompts to uninstall the program. For example:
6

Reopen QuickBooks Desktop

After uninstalling the older version(s), reopen QuickBooks Desktop and follow any prompts for updates.
  1. If QuickBooks Desktop asks you to fix the installation, click “Continue”.
  2. If QuickBooks Desktop asks you to reboot after fixing the installation, click “OK”.
Once only one version of QuickBooks Desktop remains installed, the QuickBooks Web Connector can connect to it.