Did you see a warning message Another version of this product is already installed? Well, this indicates QuickBooks error 1638. When you get this error, it indicates that you might already have QuickBooks installed. You simply need to find your version of QuickBooks and open it. The QB error 1638 occurs with the following message on the screen. In case you are experiencing a similar issue, then we are here to help you with it. This segment is written in a way to eliminate QuickBooks error 1638. We are going to discuss what factors can lead you to QuickBooks error 1638 and what measures can be taken to eliminate it. To learn further, stick around this segment carefully, or you can also consult our technical support team at +1-844-539-0188, and we will provide you with instant support and guidance in dealing with QuickBooks error 1638 and other QB-related errors.