Rekordox DJ Video

Hi, first sorry on my English!

I have 2 questions: 1st is stupid :)

1. I am Windows user but I have Macbook just for DJing and I want to update from 4.0.2b to latest 4.1.2. Whether old version I must delete (uninstall) or just download and install over existing 4.0.2b?

2. In Rekordbox DJ Video is it possible to delete history of my input custom text?

Thanks!