You will buy license, then they will update ''version" and ofcourse new version are not compatible with old one(s) and you have to buy new licences. Be carefull with this company, they cheat as much they can. Its coming 2-3 new version per year or something, good for TeamViewer bad for customer. I am company user so I am not paying myself but it is really really frustrating to update licences all the time, and finally there are cheeper and better on the market as well.