2X Client was available for download on their own website, in stead of this website. However, it is now behind a registration wall. The auto updater gives an error (404) file not found.
I think 2X abused portableapps.com to get people to use it and they're now harassing people into registering, paying, etc. Either way, it's not a free app anymore. Please stop supporting this annoying commercial effort by 2X and remove it from the portable apps.