Create a free account, and once approved, the links for downloading file will become active.
SAT files are used for AutoDesk based softwares, while STEP are used for all others.
The easiest way is to simply drag and drop the file into an active drawing.
Yes, download a free STEP viewer such as IDA-STEP.
Since there are so many different files, not all of them have been uploaded yet. Please contact dsalerno@fiainc.com with the files you need.