Sorry... I've just realised that I only have the two...
The third one is just a second download of the first. The confusion came from trying to download 7.5 again after 7.6 was released.
I've been testing at two different locations, home and office... Just after 7.6 was released, i realised i still needed a 7.5 installer but I had trouble locating the link. Obiously I've just downloaded the first one again.
Whats the best way to get to ISO release repository?