IIRC fpdebug can not be uninstalled. (some non cpu specific parts are used).
But "can not find" is a different error. FPDebug should compile empty procs on non-intel.
It should exist in components/fpdebug/
Have you tried "Tools > Config Build Laz" => "Clean all" ?
Otherwise open the package (package menu), and compile the package, and build the IDE again.