do you have experience with .jar files?
it says that you download the zip file, decompress it and run the jar file
to run jar files in linux you have to use the command
java -jar kalos.jar
this must be done from the same folder you unzipped the file, in dolphin you can press F4 key and a console will load in that same folder, copy and paste the command, it calls a gui window asking for fonts but i didn't tested it more, i think it needs a specific font to show the right characters but i could be wrong, good luck