You can either download Windows or buy it from stores.
The big problem is... it ain't cheap.
Listening ,even if you cannot understand, is the main step for speaking fluently.....
we should think how we learnt our native language..just hearing it everytime,then step by step we tried to imitate sounds and got approval..
that is why listening is the first step.....
Listening to anything English some hours a week will allow you to go further day by day..but I think ,patience is a must..........