The Godfather Saga (I think that's the right one, again I keep mixing Saga and Epic up) did originally air on network television in the USA only, on HBO I think. It was also later released on VHS in the USA but nowhere else as far as I am aware (Japanese Laserdiscs aside). I can't remember if the ending is different though.
I got the Laserdisc box sets for the same reason. I love the chronological version. Especially the earlier scenes when Vito kills the don and you see him hiding behind the wall listening in to conversations before killing him then running in to the grocers who helped him get away after knowing he was responsible. Lots of little details like that are great to see. I can happily watch the first two films without watching the turd, I mean third. With that said I haven't seen the Godfather Coda yet, the new version of part III. Is it worth a watch?
I would love to see a proper 4K UHD physical release of Epic and Saga. I think the trilogy is getting a 4K release soon so putting these versions out too would be a nice way to round it all off, perhaps with a nice dollop of HDR too.
There's some good information here:
https://en.wikipedia.org/wiki/The_Godfather_SagaOh and apparently Jeff has it on his video service you can avail of if you pay him money for free delivery for a year. Just search for The Godfather Epic on his video service. USA only from what I can see for now.