Installation of Intel Parallel Studio XE or Intel System Studio may fail and present an error message from the installer: Package signature verification failed. There are two specific causes of this failure. The most likely cause is that valid trusted root certificates cannot be found on the system. These are needed by the installer to verify that the package is good. A secondary cause is that the installation package is corrupted, or that the package has an invalid signature or time stamp. For more information, see this article.