Please copy under path of the driver, which you need, then paste the path on Internet Explorer to downolad the driver:
ftp://driver:driver@ftp.sparklan.com/WNFQ-255ACN(BT)/BT_Win7.zip



You also can use FTP tool to connect to our ftp site to download the driver:
Ftp server address: ftp://ftp.sparklan.com
Username: driver
Password: driver
Path: /WNFQ-255ACN(BT)/