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CCS/TMS320C6678: Failure to install new products

Part Number: TMS320C6678

Tool/software: Code Composer Studio

Upon first use of ccs_8.0.0.00016, .when I attempt to install new products, I get this message

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: osgi.bundle,com.ti.rtsc.NDK.product_2.21.1.38,2.21.1.38.
File has invalid content:C:\Users\richa\AppData\Local\Temp\signatureFile5046287955695245727.jar
Invalid content:plugin.xml
The file "plugin.xml" in the jar "C:\Users\richa\AppData\Local\Temp\signatureFile5046287955695245727.jar" has been tampered!