It used to be available for free here, also, via UHF antenna. We had access to strong signals from two PBS stations, one of which ran Computer Chronicles every week. I found that, as the years passed, it became more of a marketing show than a real presentation of anything worthwhile. You almost never heard them ask guests how something would actually benefit buyers, or why something was designed in an obviously sub-optimal way. There was a little more of that sort of questioning on matters of design and implementation when Mr. Kildall was the co-host. My favourite broadcast of the show was the Gary Kildall Special, which, fortunately, is also on YouTube.
I don't know if they have the exact same content, but there is also https://www.youtube.com/user/ckmogo that hosts a number of their shows, though I suspect both are unofficial (for the record, it is not my channel).