Because it is considered "End of Life" (EOL) and "End of Support" by the manufacturer, you will not find an official download link on the Rockwell Automation website for the full version. The manufacturer pushes users toward their modern FactoryTalk suite.
Platforms like HMI Source provide updates and driver fixes specifically for discontinued hardware models like the QPJ-2D100-x2P. Key Features and Compatibility quickdesigner 3.7 software download
QuickDesigner 3.7 is a legacy HMI (Human Machine Interface) software originally developed by Total Control Products (later GE Fanuc and then Pro-face/Schneider Electric) used to program older QuickPanel and PanelStation units. Because it is no longer in development, it is generally considered "abandonware" and is not publicly available for standard purchase. Download & Access Information Because it is considered "End of Life" (EOL)
Once installed, you gain access to a feature set that was revolutionary in the early 2000s: Key Features and Compatibility QuickDesigner 3