.......................................Linux....................................... - If you do not want to run out of protection (unspecified developer) (Ubuntu): 1) Right-click on the file, go to "Properties." 2) Go to the "Permissions" tab and check the box next to "Enable file execution as a program". - If the launcher did not start or an error occurred: 1) Install Java: sudo apt-get install openjdk-8-jre 2) After install JavaFX: sudo apt-get install openjfx (If you have Java 9 or 10, you need to install Java 8 and get the launcher to work from it, or completely remove Java 9 or 10.) - Important! We recommend that you run with root if you run without root privileges, then there are problems with the graphics (gpu). Run as follows: 1) Navigate to the client folder using the CD command 2) Running: sudo java -jar TLauncher-2.86.jar .......................................Arch Linux....................................... 1) Update your system: sudo pacman -Suuy 2) Install packets: sudo pacman -S java8-openjfx jdk8-openjdk jre8-openjdk jre8-openjdk-headless .......................................Debian/Mint....................................... 1) Update your system: sudo apt-get update , and then "sudo apt-get upgrade" . 2) Install packets: sudo apt install default-jdk .......................................Fedora/CentOS....................................... 1) Update your system: sudo yum update 2) Install packets: sudo yum install java-11-openjdk 3) Execute the command: "sudo update-alternatives --config java" and indicate in the field the number of the corresponding version of Java 11 to set it as default. .......................................MacOS....................................... - If he does not want to run due to protection (unidentified developer): 1) Open "Settings" and go to "Security" (General tab). 2) Click on "Confirm open". The launcher will open! - If the launcher did not start or an error occurred: 1) Install Java again by downloading the installer from the official site https://java.com/ (If you have Java 9 or 10, you need to install Java 8 and get the launcher to work from it, or completely remove Java 9 or 10.)