Hi Bibister!
If you already have the trial version of Little Reader and you're sure that your software version is the most up to date one (version 2.0.715) then you won't need to reinstall the program to get it working after you purchase a key. You will, however, need to download and import your curriculum content.
All BrillKids learning systems may be installed on UP TO 2 computers, which means you can use your license key two times to activate your installations on two different computers.
In case you have already used your two activation slots, or in case you have reformatted your computer and want to install your BrillKids software, you can manage your activation records and simply delete one of your activations to free up a slot for your other computer.
For instructions on how to manage activation records, kindly refer to this support article:
http://support.brillkids.com/entries/20427618-i-want-to-delete-one-of-my-software-activation-records-how-do-i-do-thisI hope this information helps!
Lappy