Go to the Byki website to download free language learning software. (See References.) Byki is a part of the Transparent Language company, whose programs are used by the U.S. government.
Click on the Thai choice and then type in your email address where you'd like Byki to send the download link for the software. Click on the "Get Your Download" button. You should then receive a download link in your email. Download the software by clicking on the link and following the instructions for installing the software. Using the Byki website is your best option if you are looking for free software, but it's also helpful to purchase a more extensive software package.
Go to the Transparent Language website (see Resources) to purchase a more extensive Thai learning software package that is similar to the Byki software you downloaded. Click on the "Learn More" option on the right side of the page to purchase Thai Byki Deluxe 4.
Go to the linguashop website (see Resources). This software, from the Language Learning company, will help you learn Thai vocabulary, grammar and pronunciation. Click on "Buy Now" below the product description to purchase the software.
Go to the Rosetta Stone website for learning Thai (see Resources). Rosetta Stone teaches language through interactive software based on learning levels. This may be the most costly option, but this may be the best option if you're serious about learning Thai.