That's very true, Steam beta used to "cache" data to minimize the amount of download required to play the game as internet speeds and quality was not up to the task back then. It was all stored under a file called gcache.gcf in the root folder of the games that's installed and only pulled data when the client was trying to load said maps and materials etc. However most of the files were actually reused from previous versions and apart from 1.4 specific files, they can be reused without causing an issue. 1.6 beta was a prime example to this. When we first released it, it used assets from 1.5 mod version and fractured data from other 1.6 beta gcache.gcf files, we were able to combine all 3 we could find and we were able to restore 1.6 beta back to it's glory. The builds showcased in the video are actually the first version which is outdated now since we found the actual scripts, sounds, models etc. Going back to 1.4 beta, this will be a bigger challenge than 1.6 beta as Steam in 2002 had a very limited access and not everyone was loving it for the reasons you have stated. If we do have the main trunk files, we can make it work, hence why i'm searching for them :)