I know this OS is a lower file number than the previous leaked .466 but I heard that some people are having issues with that one. If you do decide to downgrade simply delete any other OS you have install on your PC and install this one once you plug your device and run DM you should see a message to downgrade the OS.
You can pick up v18.104.22.1683 at the following link:
This OS will not install on any other BlackBerry besides the one mentioned above and is not an official release.If you do not know how to upgrade your BlackBerry OS please start by reading this step by stepguide.Don’t forget to delete the vendor.xml file located in c:program files>common files>research in motion>apploader to install it on a different carriers device. Don’t forget our usual warnings: do not download and install these updates if you don’t know what you’re doing. Incorrect procedure or just bad luck could render your BlackBerry inoperative or unstable. Thanks Tashana & Terrence for the tip.