I made it this way now..
[InstallOptions]
ApplicationName=Hitman - Blood Money
Publisher=IO interactive
GameSize=9950
MyExecutableName=hitmanbooldmoney.exe
Editor=Riddle_R
Lang=en,
[InstallSettings]
GDFBinary=GDF.dll
[ExtractSettings]
FreeArcFile1={src}\Data.arc;DestDir:{app};Disk:1;P recSrep:1
PrecompVer=Inside
Still get the same error
