first of all I'd like to beg your pardong for my poor english skills.
Without noticing, I used version 1 instead of version 4. Now I installed version 4, but my license key (I bought a key for version 4, originally) is not working. I guess I need to clear the licence key in the former installation before I can use it in the version 4, right?
Can you please tell me how I do that? Thanky.