Download MKVTool. Nix v. 17. 0. 0 open sourceImportant information regarding software downloads at After. Dawn. coms software section. Ultimate Ninja Setup.Exe. We have partnered with Air Installer to cover part of the software hosting and maintaining costs at After. Dawn. com. Clicking the Download button will download the setup file to your computer. Opening this file launches Air Installer to manage your installation process, which may offer additional and optional offers from 3rd party software advertisers. If you wish to download the original version of this software you can do so at the authors homepage see Info tab on the left. Mkvmerge Gui V5.8.0' title='Mkvmerge Gui V5.8.0' />MKVToolnix is a set of tools to create, alter and inspect Matroska files. Now simply run sudo apt update followed by sudo apt install mkvtoolnix mkvtoolnixgui. If updating the package lists fails, make sure you have the package apt.