This blog is about placing expansion files. This might vary with your edition of windows and Photoshop/Light room, but this is how it is done at my box. But I think this blog might still take the “magic” out of how it is done.

Navigation, getting to the right folder.

It can be challenging to find the right folder; the reason is that they are often hidden.

The easiest way

• Open “File Explore” (hit ÿ and type File Explore).
• In the address bar type “%APPDATA%” and hit enter

Easy… Wasn’t it

From this folder structure is it fairly easy to navigate to where you should place the extension files. In the table below is a few examples

Do read more at Camera Calibration and Lens Correction

And look at the difference.