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I have tried 3.2.5, 3.2.6, 4.0.2, 4.2 etc and I get an install error immediately after providing credentials. I provide username, password. I am admin. Then I get The "Installation Failed" error:

An unknown installation error occurred. The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.

How can I find out what the problem is?

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Do you have the last version of Snow Leopard? – Frederick Marcoux Apr 10 '12 at 1:18
2  
and did you install this: support.apple.com/kb/DL1512 (About Apple Software Installer Update 1.0. This update addresses an issue that may prevent certain Apple software from installing. This update is recommended for all users running Mac OS X 10.6.8.) – lupincho Apr 10 '12 at 10:22
    
@lupincho You should make that an answer. It fixed the problem for me! – Mongus Pong Apr 10 '12 at 19:41
    
@Pongus: I made that an answer; glad that it fixed your issue – lupincho Apr 10 '12 at 19:46
    
AAAAAR. So now I can finally install the thing that will let me install the thing that will let me install the thing that will let me install the thing that I actually need to install. .. I AM SHAVING A YAK. – Kristan Smith Jan 27 '13 at 19:07
up vote 10 down vote accepted

Install this: Apple Software Installer Update 1.0.

About Apple Software Installer Update 1.0: "This update addresses an issue that may prevent certain Apple software from installing. This update is recommended for all users running Mac OS X 10.6.8."

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thanks. It worked. Struggled with this for days. – Code Droid Apr 10 '12 at 20:17
    
want to make thousands vote up. It saves my time because i had to give update to client. – iqbal khan Apr 11 '12 at 6:28
    
Yes, that's very weird issue. I don't use SL anymore, but saw that download when looking for something else and remembered it as it is something that I haven't seen before. – lupincho Apr 11 '12 at 6:32
    
"The installation failed" :( Even after this update. I tried to install Xcode 3.2.2 on Mac OS X 10.6.8. – Benny Neugebauer Sep 14 '13 at 11:51

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