Thank you so much for that clear explanation as to where the problem is. As the inclusion of SP2 for me would cause the loss of other add-ons that I don’t want to lose at the moment, I will just have to go without the C-130X. One of the other add-ons that I do have and which would normally run using SP2, has been made to operate on Sp1, by a patch supplied by it’s developers. I can only hope that the developers of the C-130X might think it worth their while to develop such a patch for it too. I’ll keep my fingers crossed! Thank you again for the explanation. That has saved me a great deal of time trying to get the C-130X to run on my system.