Update time of my SDKs ... I launched the SDK Manager, thinking it would be a simple process, but I am at a dead end with many options.

For example, all that I want - it is an opportunity to develop and test Android 4.0.3 (API 5), but in addition SDK PlatformI see ICS_R1and ICS_R2. What is it? Do I need them?
Also, why doesn’t Android 4.0.4 appear?
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