X Plane Installer
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The steam version of x-plane is not a Laminar Research version of X-Plane. It is a 3rd party product which is slow to provide updates when officially released by Laminar research. This forum is basically for the original Laminar Research X-plane users but steam problems do get answered.
Simmarket
Latest X Plane Installer
Hi there.I had the exact same problem as you.I had a spare pc to hand with a different dvd drive in it that i tested the discs with.I attempted to copy the offending file off the dvd drive onto the hard drive of the pc i was installing it on. This too failed so i just tried another computer with a different dvd drive in it,copied the same exact file and it worked.This led me to the conclusion that my dvd drive was below par,so i swapped them and it installed perfectly.Hope this might point you in the right direction,i'm not saying it's definately the problem,but it will rule it out.regards,dAVE. Here is the solution I found to work with this. Install as much as you can with either the installer on the DVD or the downloaded installer from the X-Plane site. Neither one solved the problem for me. Eventually Cancel the installation and close it out. Go again to the X-Plane site, downloads and now download the X-Plane 10 Updater.