Sorry, but it seems that, even with the same structure, some files are missing, like one called "001_C1_.png", supposed to be in Images/Pedalier/, required by Grand Orgue when it tries to open Solignac, but there is no such file in the whole Solignac folder. As it is just the first error message I get (GO does not go further), I assume that there are other files in that case. So I think that several files have different names than those in your folders, or are simply missing...
I am really sorry to bore you, but I think that, if you still agree, I shall send you a mail and see how you could send me the whole folder of Solignac...
Thank you very much
Eric