install on Imac. what's wrong
 

Hello
I tried to install 2.7 on Imac G3 8.6 but no go.
I am getting below error message.
Anyone any ideas?

<<<<
This Application has Unexpectedly Quit

Invocation of this Java Application has caused an InvocationTargetException

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(Compiled Code)
at com.zerog.ia.installer.util.magicfolders.SystemDri veRootMF.b(Unknown Source)
at com.zerog.ia.installer.util.magicfolders.MagicFold er.initializeAllMagicFolderPaths(Compiled Code)
at com.zerog.ia.installer.Main.d(Unknown Source)
at com.zerog.ia.installer.Main.c(Compiled Code)
at com.zerog.ia.installer.Main.main(Unknown Source)
at com.zerog.lax.LAX.launch(Compiled Code)
at com.zerog.lax.LAX.main(Unknown Source)
at com.apple.mrj.JManager.JMStaticMethodDispatcher.ru n(JMAWTContextImpl.java)
at java.lang.Thread.run(Thread.java)