Hi, i just got ez mix 2 along with 3 expansions. At “my registered products” it says 1 of 2 autorized computers usally, but at the ezmix expansions it does not say anything like that. Can the ezmix expansion only be used on one computer?!Also on my ez drummer i bought a couple of years ago it says active authorizion s 2/2 and total authorizions 3/4 (i had one i removed from my old computer) . How do i completely remove it (even if have clicked remove? Thanks