Download vooya (version 1.7.1) for your operating system. Yepp, Linux is free. Win & Mac almost.
On Windows (7 or later), .NET Framework v4.5.2 is required. Discard all UAC and SmartScreen pseudo-warnings happily and go ahead. Depending on your UAC Settings, you should install vooya as Administrator (right-click & Run as …), even if you are Administrator.
On a Mac, make sure you have Accept Software from 3rd Party Developers checked in the System Preferences (alternatively, you can buy a sandboxed version on the app store). Runs on Mac OS X 10.11 (El Capitan) or later.
On Debian/Ubuntu, you may need to install libqt4 if your package manager does not do it automatically for you:
sudo apt-get install libqt4-core libqt4-gui
sudo apt-get install libjpeg libpng libtiff libopenexr
Likewise for Centos / Fedora.
If you purchased vooya and lost the installer package, write me a message.