报错信息
An error occurred while installing the items
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Install, operand=null --> [R]com.microsoft.tfs.checkinpolicies 10.0.0.201003261741, action=).
Failed to prepare partial IU: [R]com.microsoft.tfs.checkinpolicies 10.0.0.201003261741.- 1
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解决办法
Help -> Install New Software… -> Work with
-> 选择“The Eclipse Project Updates - http://download.eclipse.org/eclipse/updates/4.4”
-> 勾选”Eclipse Tests, Examples, and Extras” 下的 “Eclipse 2.0 Style Plugin Support”
安装要花点时间，耐心等待，安装完成后，再重新安装veloeclipse，一步一步便可以安装成功！
如下图 
再执行安装操作即可