Hi, a license for version 2 means that all updates regarding version 2 are free of charge. You don't need to buy it again, never.
But if maybe in some years, there could come a version 3.0 with a small upgrade fee. No plans in that direction at the moment.
Just visit our shop
, select the payment methode and follow the instructions. It should be easy. After purchase, you will receive an order confirmation and some minutes or hours later you will receive your personel license file you can use to switch the TS-Doctor application from trial to full featured mode.