I'm sorry no one has answered your questions about this product. Since it was in the Car Audio forum, many people from the store didn't see it.
I know it's been a while since you posted this, but I wanted to move this thread to the appropriate forum and provide you with an answer.
To install the drivers, just unzip the contents of the folder to your desktop then double click on the FTDIUNIN.exe file.
I'll send a note to the guys in the store to make sure and update this item on the store with this information.