Does this comes with every thing or do I have to buy adapters apart?
No, the application doesn't come with other parts. The single license of the software costs around 500 $ and the full service kit costs somewhere between 5000-5100 $. The full kit comes with software, laptop with pre-built software, cables, device and box with parts. You can find more information on the official website. However, you can buy only the product you need using the following link: https://allison.noregon.com/webstore/c-1-allison-doc-for-pc-service-tool.aspx