Please check the Download page for updates. Windows package (installer) is built now for 64 bit version by default. There are also installation instructions for Linux. Linux package does not include SWT library required to run TimeCult, it has to be installed separately.
The biggest change of the new release compared to version 0.12 is a possibility to mark a task with one of 5 flags: Urgent, Current, Next, Planned, Backlog. This makes it easier to prioritize the tasks and concentrate on the most important things.
All the best with the new version and feel free to submit your issue reports here!