Go to the
buy page and purchase the game. It costs $25 USD. Use your favorite payment method. The process shouldn't take more than 15 minutes if everything goes as planned.
After you have purchased the game, download the full installer at the
download page. Install the program as an administrator. Run the game as administrator after that, and activate your game. You should have entered an email in the payment process, so look for an email from Forward Development with your payment information. As soon as this email has been located, open it. In a new tab, visit the
activation page and follow the directions in-game, and on the website to receive your Serial Number. After this number has came into your email, put it into the game and enjoy your new product!