To flash the downloaded Lakka image to your SD card or USB thumb drive we recommend using graphical tool called Etcher. Etcher can work with compressed
.img.gz files, so it is not required to decompress the downloaded image file.
You can download Etcher from the link below. It is free/open source software.
Select the Lakka image, select the drive and hit the Flash button.
In case you cannot use Etcher, look at the alternative flashing methods.