Barkley on 20 March 2016
Well you could buy it on DVD or Blu-ray... HBO Now is only available in the US and I think you're from Brazil, but maybe you could access it with a VPN/proxy. Basically anywhere you can watch it legally will most likely have a subtitle feature, the popular torrents will probably have subtitles too.
Maybe there is another streaming service in your country that has Game of Thrones.
Edit: Ah if you don't mind waiting a bit HBO announced they will launch their streaming services in Brazil by the end of the year.
