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.
Having multiple versions of QuickBooks Desktop installed on the same computer can cause issues with Conductor. Often, this prevents the QuickBooks Web Connector from connecting to QuickBooks Desktop or causes it to crash. Please follow the steps below to ensure only one version of QuickBooks Desktop is installed on your computer.
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.Multiple versions of QuickBooks Desktop installed
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:Uninstall older version of QuickBooks Desktop
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”. Fix QuickBooks Desktop after uninstalling old version
  2. If QuickBooks Desktop asks you to reboot after fixing the installation, click “OK”. Reboot required after fixing QuickBooks Desktop
By following these steps, you can ensure only one version of QuickBooks Desktop is installed on your computer, which will help prevent issues with Conductor.