I just purchased, downloaded and installed the Songsmith Styles PAKs 1-3.
Here's what I discovered:
It's $69.00 USD.It's a quick download because it's a single .exe file under 3MB.It automatically installs the new styles into your Songsmith program, so there's nothing to figure out.
After installation you get a total of 321 styles used in the 4/4 mode and 8 styles used in the 3/4 mode.(Before the Styles PAK you only get 28 4/4 styles and 2 3/4 styles.)