CRC32 checksum failed with Cordova 2.2.0

[Andreas Sander]

Hi,
due to the fact that Cordova 2.2.0 is the last iOS 4 supporting release, I need 
to get Cordova 2.2.0 worked for my iOS project.
I've installed Cordova via npm without any problems. When I try to add iOS as a 
platform via cordova platform add ios, I get a checksum-failed error:
Downloading ios library, this may take a while...CRC32 checksum failed 
apache-cordova-ios-e5b4aaf
Can somebody help me with that?
Greets,
Andreas