Hi DualC / Mattias,
I thought you already managed to install AmiKit with OS3.9 CD as you mentioned in other thread.
Anyway, was this message always appearing when you wanted to install AmiKit or just now?
You can try the following trick. Press the "Configure WinUAE" in AmiKit Launcher. Go to "Hard drives" section and press "Add directory" button. Enter following data:
Device name: CD4
Volume label: AmigaOS3.9
Path: select the drive letter that represents your CD-ROM with AmigaOS3.9 CD inserted.
and start the emulation.
If it doesn't help, copy the content of the CD to your HDD and try the same procedure. Just point the "Path:" to the HDD location, eg. C:\AmigaOS3.9\ (and don't forget to eject the CD from the drive before you start the emulation).