The Demo version is free, but has a limited duration license. You will need to come back here every couple of months to download a new installer if you want to keep on using UVLayout.
Download the UVLayout TGZ file and extract into the folder where you want to install UVLayout. For 64bit OSs only. See Installation_Guide:_Linux for full installation instructions.
After installation, you can run UVLayout by executing the uvlayout-demo/uvlayout-run script. If setting up a launch icon, its this file you’ll need to run.