Altera USB Blaster II Driver Installation Instructions
From Terasic Wiki
Driver Installation for Altera USB-Blaster II
- Plug the USB-Blaster II cable into your PC.
 - Open the Device Manager, and right-click on the Unknown device under the Other devices branch.
 - Select Update Driver Software.
 - elect Browse my computer for driver software.
 - Enter the location of the Quartus Prime software USB-Blaster II driver files directory (<Path to Quartus Prime installation>\drivers\usb-blaster-ii) in the Search for driver software in this location field.
 - Click Next.
 - Click Install in the Would you like to install this device software? Windows security dialog box.
 - Close the Update Driver Software - Altera USB-Blaster II (Unconfigured)successful installation notification. The Device Manager now shows a new branch called JTAG cables with an Altera USB-#Blaster II (Unconfigured) node.
 - Open the Quartus Prime Programmer. Within a few seconds, the JTAG cables branch displays two nodes: Altera USB-Blaster II (JTAG interface) and Altera-USB Blaster II (System Console interface).