a) Open the device manager → Plug ACT-IR402xU-v1.3 into the PC USB port. → Under "Other devices" will see "STIr42xx" → Right-click "STIr42xx" → Click on "Update driver" → 
Select "Browse my computer for driver software" (Locate ".inf" file from folder path (...\Win7~11_Dvr\32- or 64-bit) and install driver software manually), then click "Next" → 
Screen will popup "installing driver…", and next prompt screen shows that "Windows has successfully updated your driver". 

b) ACT-IR402xU-v1.3 is recognized successfully as "USB 2.0 IrDA Bridge #xx" under the “Infrared devices” and ready to use now. If the ACT-IR402xU-v1.3 is detected as "USB 2.0 IrDA Bridge #xx" with a yellow exclamation mark and a Windows error code 19, proceed to the 2) steps to re-activate/enable the "IrDA Infrared" capability.

Note: If windows did not install the driver correctly (Code 19), do this next step:

Windows 11 OS “IrDA Infrared” feature download and install steps:

i) Install the “IrDA Infrared” component from the optional features (right click “Start” icon → Click System → In the right panel find “Optional features” and select it 
→ Click “View features” → Click "See available features" → Select “IrDA Infrared” from the list and install it). It is installed online, so be sure to have internet access!

ii) Reboot the system.

iii) Plug ACT-IR402xU-v1.3 into PC USB port.

You can now see in device manager that the IrDA is installed correctly. You may now proceed to the OdaStat-G software.