How to install the USB interface and its drivers ?
 
Windows 10, Windows 8, Windows 7 and Vista will install Windows Plug and Play (PnP) drivers for the BioSemi USB interface automatically (no drivers need to be installed). But this will only be done with USB receivers with 'firmware 4.0' or newer. (if the sticker on the bottom of your USB Receiver does not say 'Firmware 4.0' then you do not have Firmware 4.0)
So, with USB-receivers with 'firmware 4.0' It is no longer needed to download and install the USB drivers from the BioSemi USB stick or website: Windows detects the USB-receiver when it is connected, and installs the drivers automatically. USB-receivers with the latest firmware are labeled (underside) with "firmware 4.0" (receivers delivered after February 2016). If there is no firmware version shown at the underside sticker, then the firmware of the Receiver will be older than 4.0 and the Receiver will not be PnP))
Older USB-receivers will still need the driver to be installed. If your USB Receiver is working correctly, then there is no need to upgrade the firmware. But if you want to upgrade the firmware, then you can do this with the below Firmware update tool. See the boxed text below how to reprogram the USB receiver and/or clean the registry.

PS: The Firmware upgrade tool ONLY works on computers where the USB Receiver is detected correctly, with a working, new driver installed: MS WinUSB2 (see below)

ally before a USB-receiver with 4.0 firmware will be able to reinstall the drivers)
If a USB-receiver with an older (before 4.0) firmware is connected to a Windows 10 computer then the Windows 10 driver will stop working and will have to be uninstalled. See the boxed text below how to clean the registry and reprogram the USB receiver.
 
Receivers with Firmware 4.0 do not need any drivers to be installed (PnP: Plug and Play). But, when the old driver (driver name: BioSemi USB) is still installed, then the Receiver will not be able to install its own PnP driver. So, always first remove the old driver.
On (new) operating systems with no drivers installed, a Receiver with Firmware 4.0 will automatically install the Windows P&P driver (MS WinUSB2 Driver)
 
 
 
How to install the USB interface for Windows 8 or Windows 10 ?
 
When your USB Receiver has Firmware 4.0 or newer, than Windows 10 does not need any driver to be installed for the USB Receiver
If your USB Receiver has Firmware 4.0 then there is a sticker on the bottom of the USB Receiver saying "Firmware 4.0"
Windows 10 can not detect a USB Receiver with a firmware version older than 4.0.

If your USB Receiver has a firmware version older than 4.0, then you first need to update the Receiver on an 'old' computer (Windows XP, Vista or Windows 7) with working 32 bit BioSemi drivers or 64 bit BioSemi drivers installed.
After you have updated the Receiver to Firmware 4.0, it will be detected automatically on all Windows versions without any driver to be installed. (windows PnP native drivers will be installed automatically)

Unfortunately, the way Windows works is that if you have connected a USB receiver with a Firmware version lower than 4.0 to a Windows 10 computer, then the USB Receiver will no longer be detected correctly (also not after the USB receiver has been upgraded to Firmware 4.0). You will need to clean the registry and also update the Firmware of the USB Receiver. The regclean tool removes the registry information about the USB Receiver. See the boxed text below how to clean the registry and reprogram the USB receiver.
 
 
If you connect a USB receiver with an 'old' firmware (lower than 4.0) to an operating system newer than Windows 7, then the USB receiver will not be detected correctly. In order to upgrade the receiver to firmware version 4.0, you can choose to ship the USB receiver to BioSemi, or reprogram it yourself:
Ship your USB receiver to BioSemi: - BioSemi will update the firmware to Version 4.0 and ship it back to you. (free of charge)
- Clean the registry of your new PC with the RegClean tool. (without USB Receiver connected)
Reprogram the receiver yourself: - Connect the receiver to an old PC with XP, Vista or Windows 7.
- If needed, install the drivers (32 bit BioSemi drivers or 64 bit BioSemi drivers) ( do not install drivers on Windows10 !!!!!)
- When the Receiver is detected correctly, then update the firmware of the Receiver
- Clean the registry of your new PC with the RegClean tool. (without USB Receiver connected)
 
In most cases no USB driver needs to be installed, but In the case that you still need to Install the BioSemi USB drivers, then you can do this by right clicking on the file 'BioSemiWinUsb2.INF' and then select 'Install'. The Device manager will show one of the following:
 
Driver name: "MS WinUSB2 Driver" (new driver, PnP)
Driver for 32 or 64 bit installed correctly:
The Firmware update tool ONLY works with this driver installed.
Download driver "MS WinUsb2 Driver" (32bit)
Download driver "MS WinUsb2 Driver" (64 bit)
 
     
Driver name: "BioSemi USB" (old driver, not PnP)
Driver for 32 bit installed correctly:
The Firmware update tool will NOT work when this driver is installed.
 
     
Driver NOT installed correctly:
Right click on the unknown device and select to install the drivers manually.