'USBtiny' does show up in Device Manager under 'Other Devices' with an exclamation point in a yellow triangle. Liftoff drone simulator. When I click that and select 'Update Driver Software - USBtiny' and select search my computer, I get the message 'Windows could not find driver software for your device'. Also, Pro Trinket does not show up under Ports. Just follow the steps in the Adafruit Arduino IDE setup guide to add Adafruit board support to the Arduino IDE to program Pro Trinket! Don't forget to also install.

Before you plug in your board, you'll need to possibly install a driver!
Click below to download our Driver Installer.

Run the installer! Since we bundle the SiLabs and FTDI drivers as well, you'll need to click through the license

Select which drivers you want to install, we suggest selecting all of them so you don't have to do this again! Radio silence for windows.

On Windows 7, by default, we install a single driver for most of Adafruit's boards, including the Feather 32u4, the Feather M0, Feather M0, Express, Circuit Playground, Circuit Playground Express, Gemma M0, Trinket M0, Metro M0 Express. On Windows 10 that driver is not necessary (it's built in to Windows) and it will not be listed.

The Trinket / Pro Trinket / Gemma / USBtinyISP drivers are also installed by default.

You can also, optionally, install the Arduino Gemma (different than the Adafruit Gemma!), Huzzah and Metro 328 drivers.

Click Install to do the installin'.

If windows needs the driver files (inf/cat) for some reason you can get all the drivers by downloading the source code zip file from this link:

And point windows to the Drivers folder when it asks for the driver location