Thanks for your interest, and let me answer your questions one-by-one:
1) you will get to download an executeable, containing a few HTML files (installation manual), and two folders (named ASP and SQL)
ASP: a set of ASP files and javascript files (.asp and .js), plus all image files
SQL: a few SQL scripts (.sql)
2) you will use the built-in database manager (refer to installation manual) to install the sql script(s) -. And you will run it on your own server.
3) yes, feel free to edit but you cannot redestribute the modified code without our written consent. You can post the modified code into our mod forum and have others examine it for you.
Let me know if you have other questions