If your CrashPlan Disappears / Missing / Vanished
Log in here (username being your email) https://code42.ceejay.net:4285/, Then go to App Downloads at the left of the screen.
Click to download the operating system you are using with the newest version. In our case it is Mac OS X and Version 5.4.1.
Once downloaded install the CrashPlan client. If the installer does not open try downloading the installer to a different location i.e Desktop.
Once installed reboot the machine your are using.
When rebooted open up the CrashPlan client and log in. If asked for the server address enter "code42.ceejay.net:4282".