Hi guille_retro!
If you customized a lot of your lessons, or you made your own lessons, you can save a backup of your complete lesson library. Transfer the backup file(s) to your new computer, then after reinstalling the programs there, double-click the backup files to restore the lessons.
Instructions for saving backup files:
http://support.brillkids.com/hc/en-us/articles/204596154(The steps are the same for Little Reader, Little Math and Little Musician)
If you didn't do any major edits/customizations to your lessons, you can skip doing the backup and proceed with the following:
1. Remove your old computer from your LR, LMh & LMs license key activation records:
http://support.brillkids.com/hc/en-us/articles/2045978042. Download and install LR, LMh & LMs in your new computer:
Installing Little Reader -
http://support.brillkids.com/entries/20370881Installing Little Math -
http://support.brillkids.com/entries/20432326Installing Little Musician -
http://support.brillkids.com/entries/21317172I hope this helps!