Thanks for the reply wahlerstudios.
I was asking the question because I tried... I went to my Presonus account, clicked on "Download the installer" I entered the requested information and the serial number on the Lexicon page that appeared, I clicked on submit, the page with "Thank you for registering" was displayed, but I never received the link to be able to download the plugin.
I did it at least 4 or 5 times, I checked my spam filter and I even tried by disabling my antivirus and my firewall but still nothing.
That's why I asked the question because I told myself that as I had already installed in my other computer we were entitled to only 1 activation ...