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CCS5.2 update compiler 7.4.0 error

hello,

When I update the compiler encountered the following problem:

An error occurred while collecting items to be installed
session context was:(profile=epp.package.cpp, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
  Problems downloading artifact: org.eclipse.update.feature,com.ti.c6000.7.4.help,7.4.0.
        Error reading signed content:C:\Users\ZQ\AppData\Local\Temp\signatureFile5647989177583526118.jar
An error occurred while processing the signatures for the file: C:\Users\ZQ\AppData\Local\Temp\signatureFile5647989177583526118.jar
   Problems downloading artifact: osgi.bundle,com.ti.cgt.c6000.7.4.help,7.4.0.
        Error reading signed content:C:\Users\ZQ\AppData\Local\Temp\signatureFile1368185438113357623.jar
An error occurred while processing the signatures for the file: C:\Users\ZQ\AppData\Local\Temp\signatureFile1368185438113357623.jar

To update, go to  Help ->Install New Software->Code Generation Tools Updates->C6000 Compiler Help 7.4.0

          Code Composer Studio Version: 5.2.1.00018

           Thanks in advance,