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Trying to fix QuickBooks error 1638, but unable to do so? Well, we can help you with that. QuickBooks error 1638 is basically an installation error that shows up with a warning message that states: Another version of this product is already installed. If you get this particular error in QuickBooks, then it simply indicates that you might already have QuickBooks installed. You will have to find your QuickBooks version and open it. To help you in dealing with QuickBooks error code 1638, here we are with this segment sharing the complete details about the error, its causes, and the quick fixes that can be implemented. To learn further about this issue, stick around to this segment or you can also get in touch with our technical team at  +1-844-499-6700, and let our experts help you with your queries immediately.

Also Read: How to fix QuickBooks error 1618?

Factors causing QuickBooks error 1638

A bunch of factors can trigger QuickBooks error 1638. Let us evaluate each of the factors one by one: 

  1. In case there is any sort of virus or malware infection. 
  2. Another probable reason can be if the software installation guidelines aren’t followed appropriately. 
  3. You can further come across a similar issue if the software is already installed on the system and you are trying to install it again. 
  4. Such an error is also triggered when the installation source is damaged. 
  5. Or if the Windows firewall settings are blocking QuickBooks installation. 

Methods to eliminate QuickBooks install error 1638

To get rid of such an error in QuickBooks, you can try performing the below methods one by one: 

Method 1: Spot QuickBooks version 

As this error indicates that QuickBooks is already installed, you need to locate the QuickBooks version present on your system. This can be done as follows: 

  1. You need to first press the Windows + R tab and this will open the Run command. 
  2. Once done with that, type the control panel in the search box and hit the ok tab. 
  3. Click on the programs tab and further go for programs and features. 
Uninstall programs and features - QuickBooks error 1638
  1. Later on, if you see QuickBooks in the list, double-click on the same. 
  2. And wait for the program to open. 

You might find this helpful: Upgrade or Convert Your Company File to a New QuickBooks Desktop Version

Method 2: Open QuickBooks 

Open QuickBooks
  1. Here, you will have to click on the start tab. 
  2. Further, choose all programs and also click on QuickBooks. 
  3. Once done with that, choose the correct QuickBooks version.

In case you still experience the same issue, then repair QuickBooks.

Method 3: Repair QuickBooks 

If you are still facing the same issue, then simply carry out the steps to repair QuickBooks. The steps involved in this process are: 

  1. Initially, download the QuickBooks tool hub
QuickBooks tool hub
  1. Once done with that, close QuickBooks and all the other windows related to it. 
  2. The next step is to download the latest version of the QuickBooks tool hub and save it to the desktop. 
  3. You are then required to open the downloaded file and perform the onscreen prompts to install it. 
  4. Heading forward, you need to head to the location where you have saved the tool hub, and furthermore, double-click on its icon to open the tool hub. 

Run Quick Fix My Program 

Run Quick Fix My Program - QuickBookss error 1638
  1. Now that you have downloaded the tool hub, try opening it and heading to the Program Problems tab. 
  2. Later on, click on Quick Fix My Program. 
  3. You also need to open QuickBooks. 

In case repairing doesn’t fix it, then head to the process ahead. 

Also Read: QuickBooks File Doctor Tool – Download, Install & Use

Method 4: Clean Install QuickBooks 

If none of the above methods helped you in eliminating the error code 1638 in QuickBooks, you can try this last method that includes clean installation of the software. 

  1. Uninstall QuickBooks
    1. Here you will first have to log in system with admin rights 
    2. Further, press the Windows start tab. 
    3. Also, enter the control panel in the search box and hit the enter tab. 
    4. Once done with that, choose programs and features or uninstall a program under the control panel window. 
    5. You will later have to choose your version of QuickBooks from the list of programs. 
    6. Toward the end, choose uninstall and click on the next tab. 
Uninstall QuickBooks desktop - QuickBooks error 1638
  1. Run QuickBooks clean install tool 
Clean installation - QuickBooks error 1638
  1. Reinstall QuickBooks program
    1. Perform the steps to reinstall QuickBooks. 
    2. Find and open the QuickBooks.exe file and perform the onscreen steps to complete the installation. 
    3. Do not forget to accept the software license agreement and click on the next tab. 
    4. At the end, enter product and license numbers and hit the next tab. 


Getting rid of error code 1638 in QuickBooks becomes easy, once you perform the set of steps enumerated above. However, if you still have any queries that are to be addressed, then simply reach out to our technical support team at  +1-844-499-6700, and our certified QuickBooks professionals will answer all your queries instantly. 

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