Now that you have the Ei.cfg file, here is how to integrate it into your Windows 8.1 Pro ISO or USB drive.

By adding or modifying the Ei.cfg file, you force the installer to behave exactly how you want it to—specifically, forcing it to install .

You typically the file from a website—you create it manually in Notepad. However, if you need a pre-made one:

The Ei.cfg file is just one of three ways to control Windows Setup behavior. Here is how they compare:

Now that you have mastered the Ei.cfg file, you never need to search for “Download Ei.cfg file for Windows 8.1 Pro” again—because you can make your own in under 30 seconds.

| Issue | Solution | |-------|----------| | | Enable file extensions in File Explorer, rename to just Ei.cfg . | | Incorrect edition ID | Change EditionID to PROFESSIONAL (all caps, no spaces). For 8.1 Pro N, use PROFESSIONALN . | | Wrong folder location | Ei.cfg must be inside the \sources\ folder, not the root of the ISO. | | Modified ISO rebuilt incorrectly | Use proper ISO editing software that preserves UDF format. Do not just drag files into UltraISO in “Standard” mode—use “UDF 1.02” or “UDF 2.50.” | | Windows 8.1 ISO from Volume Licensing | Volume license ISOs (VL) often ignore Ei.cfg. You need a Retail or OEM ISO. |

Let’s decode each section:

For full automation, combine ei.cfg with pid.txt (in the sources folder) to pre‑supply a product key.

powered by Advanced iFrame. Get the Pro version on CodeCanyon.