I know this has been covered before, but I'm having the same issues. The only difference with me is that I've actually run the Flight1 registry checker and still have no luck. When I try installing the MD-11, I get:"FS9 Version 9.1.0.40901 (FS9.1 at least)required. You only have FS9 Version 9.0.0.30612 installed. Please install FS9.1 or later to use this product." The trick is that I've already installed the 9.1 update. When I try installing the update again, I get a message that it's already installed. I would really like to not have to uninstall FS9 and re-install everything again, due to the amount of scenery and aircraft I have for it. Any help would be greatly appreciated. Thanks in advance.

I know this has been covered before, but I'm having the same issues. The only difference with me is that I've actually run the Flight1 registry checker and still have no luck. When I try installing the MD-11, I get:"FS9 Version 9.1.0.40901 (FS9.1 at least)required. You only have FS9 Version 9.0.0.30612 installed. Please install FS9.1 or later to use this product." The trick is that I've already installed the 9.1 update. When I try installing the update again, I get a message that it's already installed. I would really like to not have to uninstall FS9 and re-install everything again, due to the amount of scenery and aircraft I have for it. Any help would be greatly appreciated. Thanks in advance.

Are you using a CD 4 crack? Vincent

No. I'm using a licensed copy of the software running it from the cd. No cracked version is being used. Still getting the same error message.P.S. Sorry for not signing my posts. I'll set up a sig file. :)

Hi Raymond;i think you need crack... Try this: http://flyawaysimulation.com/downloads-fil...20-details.html Some time ago i had the same problem with this. First update to FS9.1 and move fs9.exe crack file to FS9 root folder. Now you can install PMDG MD-11 :)Kamil Nowicki

Good news! :( I was finally able to install the MD-11. Here's the fix. Go to your FS9 root folder and look for the FS9.1 update uninstaller. Run that program and then re-install the FS9.1 update. This should update your FS9.exe file and allow the MD-11 installer to run.