Cannot "Use Local Firmware" without internet connection

[Nawakland]

SpeedyLoader v1.6.0
Use local firmware feature

There is an issue with SpeedyLoader to upload Speeduino firmware into Mega board when there is no internet connection.
The software is stuck on the empty "Available Firmwares" view and it's impossible to use the "use local firmware" button (no effect).
It looks like there is no timeout on the online firmware retrieve function and it freezes the app.

For the moment my workaround is to use Arduino IDE to upload Speeduino Sketch without internet connection available.