If the official site is unavailable, trusted driver repositories host older 802.11n packages: DriverScape
If you’ve recently picked up an (like the popular BL-WN151 or BL-WN351 ), you might have noticed it isn't always "plug-and-play" on older systems. Whether you lost the mini-CD or your laptop doesn't have a disc drive, getting the right driver is essential to unlock those N150 or N300 speeds.