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  1. AFAIK, the prebuilt OpenCV 3.0.0-alpha was built with IPP 8.1.1 enable (this is a compact version for OpenCV only, not the full version, see more at link1) but not TBB. TBB is for boosting OpenCV algorithm by parallel mechanism by employing the multicores architecture. So it is depend on your requirement, if you need for speed, than rebuilding with TBB enable is a good choice.
  2. The problem you got with was due to the fact that the cmake program could not download it correctly and then it failed to unzip it (in OpenCV 3.0.0, the option with IPP is default as it is really efficient) for building OpenCV. The solutions are simple: you can delete it (the file and rerun cmake and it will download the file from internet, or you can download it manually from this link and then replace the wrong version, then rerun cmake again.