Path not valid in setting up Firmware Updater

Want to upload new firmware and I cannot get path to avrdude to be OK.
C:\Users\Bengt\Desktop\wiring-v1.0.1-dev\tools\avr\bin; this is in system and user path on Win8

Latest Octoprint and Firmware Updater

Cheers Bengt

Have you tried entering the full path to the avrdude executable? Like this...

C:\Users\Bengt\Desktop\wiring-v1.0.1-dev\tools\avr\bin\avrdude.exe

Sorry but it doesn´t either, so I will give up trying to update via Octoprint.

Is this a case where the firmware updater is passing the string through something that thinks "\" is an escape character? Try C:\\Users\\Bengt\\Desktop...

Just a guess, put the executable (plus any required files) in the root of C and report result.
Maybe the path is too long.