Download the VN Video Editor app from the App Store/Google Play Store

Once you've completed the purchase, you'll see a button that says "Access your presets". Click that to download the .zip file. The LUTs will be sent to the email address you used to checkout as well. (If you used PayPal to checkout, they'll be sent to the E-Mail address associated with your PayPal account)

 

Click on the arrow icon in the top left corner and then press the "Downloads" button

In this folder you'll see the .zip folder

Click the folder to unzip it and another folder will appear.

Open the VN Editor app and add a clip from your camera roll. Click the "Filter" icon from the bottom menu.

Click the "File App" folder to import your LUTs.

Go to the unzipped folder and you'll see the .cube files, these are the LUTs. Click one to import it into the app.

Add the LUT to a file folder, you can name it whatever you'd like.

Click "Create Filter Library" to create your folder

Repeat importing all the .cube files into the new folder in the app, once you're done it will look like this.

Click the LUT you like best and use the Intensity slider to adjust the LUT to your liking.

You're done! All the LUTs you downloaded will be saved to the app so you can go back at anytime to edit!