[Solved]Unity hub?

I recently downloaded unity hub, however when I try to add a new version of unity I cannot find how to do it, I assumed it was the files but it needed an application, does anyone know where this would be.

I am using window 10

Any help is appreciated, thanks!

By default, all installations of Unity downloaded through Unity Hub are stored here:
C:\Program Files\Unity\Hub\Editor

Sorry, I must not have explained properly, I am looking for the versions of unity I download before unity hub to add to it, or will I have to re-install them through unity hub?

Never find I found the .exe file for unity and successfully added it too the launcher, but thanks anyway!