Failed to prepare partial IU: [R]com.googlecode.veloeclipse.ui 2.0.8.

work around:

go to Help -> Install New Software..., choose "The Eclipse Project Updates - http://download.eclipse.org/eclipse/updates/4.4" from the "Work with" list and then in the "Eclipse Tests, Examples, and Extras" category check "Eclipse 2.0 Style Plugin Support" and install it. After restarting Eclipse, install veloeclipse again and this time the installation will succeed.

 

 很关键，我用的是mars 4.5版本，安装 fat jar的时候出错 Failed to prepare partial IU。用上面的方法可以成功。