Here is how you can fix Error 1638: Another version of this product is already installed in QuickBooks Desktop:

QuickBooks is an innovative accounting and bookkeeping software, but like any other computer software, it too has its limitations. Various categories of errors show up on users’ screens and refrain them from completing their tasks. In this article, we will discuss an installation error in QuickBooks Error 1638. Users receive the following error message when this error occurs:

Error CodeMessage
Error 1638:“Another version of this product is already installed.”

If you, too, have received this error, you can perform the troubleshooting steps provided further in this article to fix it and resume your work.

What Causes of QuickBooks Installation Error Code 1638?

One or more of the following situations may be the cause of QuickBooks Error 1638:

  • QuickBooks desktop Installation guidelines aren’t appropriately followed.
  • One QuickBooks Desktop program is already installed on your computer.
  • The program’s installation source is damaged.
  • Windows Firewall settings are blocking QuickBooks Installation.
  • A virus or other infection is causing the issue.

Read Also: How to Fix QuickBooks Won’t Accept Product Number During Installation Error?

Solution Steps for Fixing QuickBooks Install Error 1638

Now that you know about the possible causes of this error, let’s look at the solutions.

Step 1: Locate your QuickBooks version

  • Press Windows and R keys simultaneously on your keyboard to open the Run command.
  • In the search box, type Control Panel and press OK.
  • Click on Programs and then on Programs and Features.
Launch Programs and features - Screenshot Image
  • Next, if you see QuickBooks in the lists, double-click on it.
  • Wait for the program to open.

Step 2: Open QuickBooks program

  • Click on the Start button on the keyboard.
  • Select All Programs and then click QuickBooks.
Open QuickBooks program - Screenshot Image
  • Select the correct QuickBooks version.

If you still receive QuickBooks error code 1638, then you will have to repair QuickBooks desktop.

Read Also How to Update and Use the New Built-in Browser for QuickBooks Desktop?

Step 3: Repair QuickBooks desktop

Perform the following steps in the sequence as provided below:

  • Download the QuickBooks Tool Hub.
  • Close QuickBooks and all the other Windows related to it.
  • Download the latest version of the QuickBooks Tool Hub and save it on your desktop (or any convenient location)
  • Open the downloaded file (QuickBooksToolHub.exe) and follow the on-screen prompts to install it.
  • Accept the terms and conditions and wait for the installation to complete.
  • Go to the location where you have stored the Tool Hub and double-click on its icon to open the tool hub.
QuickBooks Tool Hub - Icon

Run Quick Fix My program

  • Open the QuickBooks Tool Hub and select Program Problems.
  • Next, choose Quick Fix My Program.
Program Problems tab in tool hub - Screenshot Image
  • Open QuickBooks Desktop.

If repairing QuickBooks Desktop doesn’t fix this installation error, move on to the next step.

Step 4: Clean Install of QuickBooks Desktop

Uninstall QuickBooks program

  • Log in to your computer with admin rights.
  • Press the Windows Start button on the keyboard.
  • Type “Control Panel” in the search box and press Enter key.
  • Select Programs and Features or Uninstall a Program under the Control Panel window.
Uninstall or Reinstall QuickBooks - Image
  • Next, choose your version of QuickBooks from the list of programs.
Clean Install Utility - Screenshot
  • Lastly, you need to select Uninstall and then click on the Next tab.

Reinstall QuickBooks program

  • Find and open the file QuickBooks.exe.
  • Follow the onscreen prompts.
  • Accept the software license agreement and click on the Next tab.
  • Enter your Product and License numbers.
  • Select Next.

Also see: Fix QuickBooks Runtime Library Errors & MS Visual C++ Errors

Final Words

We hope that you find this article helpful in successfully fixing QuickBooks Error 1638: Another version of this product is already installed. If you have any queries or you need any further assistance, contact our round-the-clock QuickBooks error support team of certified technicians.


Is there a specific version of QuickBooks affected by Error 1638?

This error can erupt in any QuickBooks version that requires Microsoft .NET Framework for the update installation.

Are there any specific prerequisites I need to consider before attempting to resolve Error 1638?

Yes! Following are some necessary prerequisites that need to be given due consideration:
1. Make sure to log in as an administrator.
2. Create a Backup of the company file.
3. Internet connection should be seamless.

Can QuickBooks Error 1638 be resolved by reinstalling Microsoft .NET Framework?

Yes! Reinstalling Microsoft .NET Framework can help resolve this error as this Microsoft component forms a necessary backbone for the seamless functioning of QuickBooks.


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