This is a rare error that can be fixed by re-installing Legacy from the Web. Usually there is no need to uninstall the program.
Previous version of Legacy: Click Here and download the final release (build) of your version.
Optionally:
We think a spyware scanner or AV program is affecting the XceedZip.dll file in the C:\Windows\System32 folder (for 32-bit computers) or C:\Windows\SysWOW64 folder (for 64-bit computers) . Don't let this be touched as it stores the registration for the compression program we use for backup. Please uninstall Legacy, restart your computer and reinstall, using the latest build from our website. Make sure you have all other programs shut down and your anti-virus software disabled when you install Legacy.