The instalation is very simple, just unzip and copy/paste your files or upload via Extensions > Installer
After you made the instalation just go to Extensions > Modules > OC Ajax Live Price Changer And choose Enable.

It works on SELECT and RADIO option and will update the price and the old price (if it's special) for customers to know how much they will have to pay or to see how much the product is on sale.

The extension is made with the default theme, for custom css template just email me your product.twig file from your theme folder and I will make the changes for you.