If the X-Plane installer gives an error about a failed file extraction, it is almost always because your DVD drive cannot read the disc. X-Plane is distributed on dual-layer DVDs, which are sometimes more difficult to read in older DVD drives. Take note of the file reported in the error message and try to copy it from the DVD (using the Finder in Mac OS or Windows Explorer on Windows). If possible, try copying the file into a different folder. If multiple DVDs cannot be read, it is likely that your DVD drive is to blame. If, however, only a single DVD is causing problems, it is more likely the DVD is defective. Defective discs will be replaced by Laminar Research free of charge; simply email our tech support at info@ x-plane.com.