• LibUSB-64bit libusb-win32-bin-1.2.1.0 bin x86 (for 32 bit users) 9)click install now to install the driver. 10)if a windows warning appears telling this driver is not verified, just click on 'install this driver software anyway' 11)once the driver completes installation saying 'installation successful' click ok. You are good to go!
• Download and install the libusb win32 library, libusb-win32-filter-bin-0.1.12.2.exe Download and install the latest version of the Atmel Flip application for windows. This is required to get the drivers for the bootloader mode of the microcontroller.
• Download Input Output Audio Driver Controller - Preview the input and output drivers that you have installed from all the sound cards you have installed on your computer with this app.

1. Download Libusb-win32 Input Devices Drivers
2. Download Libusb-win32 Input Devices Driver Printer

For some time now, those wanting to use the Adafruit Industries USBTinyISP with the 64-bit versions of Windows 7 or Vista were faced with the following errors when attempting to install the device drivers supplied by Adafruit:

The package provides the installation files for Microsoft USB Input Device Driver version 10.0.4. If the driver is already installed on your system, updating (overwrite-installing) may fix various issues, add new functions, or just upgrade to the available version. Download libusb-win32 - A handy and easy to implement library designed to allow developers to access their USB devices from within the applications they create.

Download Libusb-win32 Input Devices Drivers

For some reason, the 32-bit versions of these operating systems don’t prevent the unsigned drivers from being installed, although they do complain.

There are a few workarounds that involve hacking Windows or disabling digital signature checking, but thanks to a tip by user wayneft on the Adafruit support forums, I was able to make the process much more straightforward.

The USBTiny drivers are based on libusb-win32. Based on some notes I found on the libusb-win32 wiki, I discovered that the latest libusb drivers contain a proper digital signature:

Vista/7 64 bit are supported from version 1.2.0.0 since a Microsoft KMCS accepted digital signature is embedded in the kernel driver libusb0.sys. libusb-win32 based device drivers can also be submitted for Microsoft WHQL testing. Several companies have successfully finished the WHQL testing with their libusb-win32 based driver package. This will allow the customers to install the driver without a warning under current 32bit/64bit Windows.

This is good news!

I downloaded the latest version of libusb-win32 (1.2.1.0) and used the included inf-wizard tool to create new drivers for the USBTinyISP:

I used the Windows device manager to upgrade the broken drivers on my Windows 7 64-bit machine. There is still a warning that “Windows can’t verify the publisher of this driver software” but there are no more errors about digital signatures and the new drivers appear to install and work correctly.

Download Libusb-win32 Input Devices Driver Printer

I haven’t done a huge amount of testing with the drivers, but I was able to communicate with the USBTiny via avrdude and flash a simple program to an AVR. I also haven’t tested this fix on Vista, as I don’t have access to a computer running it. If anyone tests these drivers on Vista x64, please post your results in the comments!