It's 26 episodes long, at 45-55 minutes each, so I haven't got through the whole thing yet. AFAIK, the entire series is on DailyMotion. And available in a remastered (and switched from 4:3 to 16:9) version.
The narration by Laurence Olivier, and arresting music (especially the main theme), lend the series a lot of gravitas. It opens with the detailing of the crimes of Oradour-sur-Glane, but does go into the pre-war backgrounds of Germany and Japan, as well as detailing the Nuremberg trials and beginning of Cold War tensions after the war.
One important thing about the series is the fact that it is, at this point, forty-five years old. This means that in some areas it will be outdated - for example, it predates the declassification of Bletchley Park and the opening of the Soviet archives - but it also means that the film-makers were able to interview a great many people who were involved in the war, from private soldiers to important politicians. Particular coups include Albert Speer, Sir Arthur Harris and one Brigadier-General James Stewart.
e: A remastered, un-cropped version is available on Blu-Ray off Amazon for just over thirty quid.
It’s on amazon but I’m guessing you’re not keen on paying for it!