Ensure to have installed the Java Runtime Environment (at least version 6), otherwise download and install it for any operating system from here; on GNU/Linux could be possible to get it also from the repository. To run the program on Windows do double click on win.bat, on GNU/Linux, macOS and other UNIX, do double click on unx.sh. Sometimes could be necessary to increase the heap memory size (mainly when deleting files of 50/100 MB or more), see the official documentation. Scan the QR Code and preserve the data.
To get the safer release with 256 bit key please go to here.