USB Blaster for DE1 board

The simplest way to install the USB blaster drivers is actually not through Device Manager.

I realised only recently that Quartus does come with an installer package for the drivers, which for some reason doesn't run during the installation process.

Simply run one of the following:

From Powershell:

$env:QUARTUS_ROOTDIR\drivers\DPInst.exe

From CMD:

%QUARTUS_ROOTDIR%\drivers\DPInst.exe

From windows explorer, navigate to the directory below and double click on "DPInst.exe"

C:\altera\<version number>\quartus\drivers\

That will install the USB Blaster and USB Blaster II drivers such that they will be automatically be used by Windows when you plug in the hardware. You don't have to have the hardware plugged in to install them, so useful for deploying software too.