try this, move all Data#.cab files into 1 folder ( along with autorun.exe, setup.exe, etc.
edit setup.ini
Code:
[ExtractSettings]
FreeArcFile1=Data1.cab;DestDir:{app};Disk :1;
FreeArcFile2=Data2.cab;DestDir:{app};Disk :1;
FreeArcFile3=Data3.cab;DestDir:{app};Disk :1;
FreeArcFile4=Data4.cab;DestDir:{app};Disk :1;
see if it will install then.