I took the unzipped d/l and placed it into the /program files/.../BtS/Mods folder. Then I clicked it to self extract, which it did.
I then launched BtS and selected Load a Mod from the advanced screen. I selected song...2 and as I described above got that far.
I'm not unfamiliar with installing mods as I've been very active with RoM and AND from their respective beginnings. I am also testing VIP, 20000BC, and Caveman to Cosmos.
I also tried extracting the Mod outside of the BtS directory path and then copy/paste the Mod into the program...BtS/Mod folder. It didn't work either.
Then I went into the Mod and un7z'd the SDK build which then gave the SDK folder that wasn't unpacked before, hence the Double Unzipping reference.
I'll remove everything and try 1 more time. I also could not get the 1st song2 version to play either.
I have a x64 OS, Win XP Pro. I run always as Administrator.
I play Dune Wars, Moo2Civ5.1, Planetfallv13, and K-mod all with no problems too.
It's quite perplexing.
JosEPh