free license issue

hi folks…
i’m new to unity (downloaded yesterday) and have a question about the free license-thing.

i downloaded unity3D free from the website. after installing it asked me to register online, which i did. later, i discovered the free (until april 8th) licenses for android and ios. i “bought” those together with (another) unity3d free version.
i got a serial per mail. can i use it to activate my already installed and registered version, or do i have to install it again, using the serial i got?
do i have 2 free licenses now, one with Android/ios support (ordered manually), one without (registered automatically)?

thanks
STEP

You do have two free license. You don’t need to reinstall Unity. Just use your new license file (Menu->Help->Enter serial number).