The binary from CloudFront looks to be a convenience to avoid building node-webkit. From the readme:
Then we have to do some juggling (unless you fancy building node-webkit from source).
You can get the source for node-webkit and build it yourself[1] but it looks to be time consuming and requires a significant amount of disk space.[1]: https://github.com/rogerwang/node-webkit/wiki/Building-node-...
Actually, its not so much node-webkit as chrome/webkit inside it. that took a few days to download correctly and then a few nights to build.
i did it when i was still on snow leopard and needed nw.
There is no real point for LightTable to be providing some bunch of binaries. A pointer to node-webkit would be enough, they have binaries (and build instructions) on their github front page.
There are a few more funnies there: .gitignore does not ignore the binary files added by these scripts, if there is a new node-webkit and then LightTable release and you re-run the script, your local old node-webkit copy will overwrite the new copy you just downloaded :)
Someone needs some solid packaging help. Oh and node-webkit people need a LOT of very good packaging help. Their build process is so convoluted, it might actually spawn an extra-dimensional entity.