No the 96.77mb is compressed. It's 231mb uncompressed.
You don't have INF SCP so you have to run a SCP standard version which includes a massive amount of INF files. If you run without these files it won't work unless you have INF SCP installed. This is a hybrid release that will run on INF SCP or regular FS2 SCP, however if you want it running on FS2 SCP you have to download more files. You don't need these files if you have INF SCP. I need to have complete compatability with INF SCP so files like the FS2 ships used and the HTL stuff are all provided, since they won't be there in INF SCP. It uses few FS2 retail files, and so that's why it's large.
Since this'll be released far before INF SCP, the SCP standard will be the most used version, as currently only the INF staff can play it on INF SCP