issue with licenser and cubase element 8 Mac

hi all,(sorry for english im french)
i just get cubase 8 element on my laptop(OSX10.11) now i want it on my second computer(OSX10.10)… i have no use key only e-licenser… but i can register my activation code on second computer… i read a lot of topic who said that is possible to use it on 2 computer but not at the same time… so why i can’t register my code on the second computer.
thanks you
OS… mac OSX10.10 and OSX10.11