JD,I tried upgrading from 4.01 to 4.2 in prep for 4.3 for FSX.Get error message that FS is not installed.It is(C drive FS9).RC 4.01 is on my G drive.I ran makerunways.exe and copied the r4.csv file to data as instructed.I am getting the same error message about FS not installed.I am not using anything different then before.Thanks,Ron

when do you get the error message? when you click rebuild scenery database?start rc, click debug, cause the error, and send me the .logjd

I think I might have found the problem.I bet I am supposed to copy RCV4_3831 into main rc4 directory.I just tried running it thinking it would install itself.Am I right?Thanks,Ron