You need to run the .jar file.
Also, you should run that console command in the same folder as the .jar file.
If you want that simplified
- copy/move the .jar file into your "My Documents" folder
- type or copy-paste the following 3 lines into notepad
- Save it as "CubeTwister.bat", on your desktop or in your "My Documents" or wherever it's easy to find
java -jar <insert_name_of_jar_file_here>.jar -Xmx512M
- Double click the new file
*as for that last line with the red text, for example the .jar file is named CubeTwister, it should be
java -jar CubeTwister.jar -Xmx512M