Help working on an older project

So, I am trying to help someone debug some issues with their app. I was told original developer made it using Cocos… however, now I’m realizing that it was made back in 2013 using a forked version of Cocos Builder? (I don’t know much about cocos builder or the early days of cocos) What I do see is that the cocos builder site seems to be down… so I guess my question is, can somebody advise on how I would get this old project to open up in the cocos editor? Is it a straightforward process? It looks like they are saying they used editor version 3.17… but then they also mention a cocos builder fork with custom spine functionality… I don’t quite understand the difference between the two so wanted to see if anyone could offer some insight?