As an owner of Sony Vegas Pro 20 ...not 365 ..I have activated my licence once on my pc and i find i cannot open it on my other pc ..i get error 20 ..It says 2 users in my Magix login (my products ) one user 1 obviously used but it won't let me open user 2 simultaneously on my other pc .Does this mean i have to de activate one licence on my main pc? and restart the licence on my other pc which is just giving me an error 20 all the time .Or can this licence happily work on two pcs? .All i want to do is run it on two pc's simultaneously (at the same time ) but it seems all you can do is deactivate your existing licence .There is no button to add another pc or when i use my other pc it gives me error code 20 .This is perpetually hellish. So all i can assume is it runs only on one pc and not 2 as it says it does . Any help, i would be grateful.