I have an older, portable version lying around in my machine and I really liked it (though knowing very little about compositing when I downloaded it). It helped me do some nice animations to explain a few things through video. Now I'm a bit surprised that they require you to register to download any version... I know it's free, but it still feels unnecesary... I just want the file, why do I have to register?
Here is an unencumbered download link for Linux: http://downloads.natron.fr/Linux/releases/64bit/files/Natron... Replacing Linux with Windows does not work for me, but it may for you if you are using that OS.
-----
Windows 64bit: https://downloads.natron.fr/Windows/releases/64bit/files/Nat...
Windows 64bit Online Installer: https://downloads.natron.fr/Windows/releases/64bit/files/Nat...
Windows 64bit zip: https://downloads.natron.fr/Windows/releases/64bit/files/Nat...
Mac: https://downloads.natron.fr/Mac/releases/Natron-2.0.5.dmg
Linux TGZ: https://downloads.natron.fr/Linux/releases/64bit/files/Natro...
Linux Online Install: https://downloads.natron.fr/Linux/releases/64bit/files/Natro...
Linux Portable: https://downloads.natron.fr/Linux/releases/64bit/files/Natro...
Linux RPM: https://downloads.natron.fr/Linux/releases/64bit/files/Natro...
Linux Debian: https://downloads.natron.fr/Linux/releases/64bit/files/natro...
Note: Future versions - URL is in form
http://natron.fr/login?os=Linux&file=https:
//downloads.natron.fr/Linux/releases/64bit
/files/Natron-2.0.5-Linux-x86_64bit-portable.tar.xz
- Remove the http://natron.fr/login?os=Linux&file=
part and you are good to go.