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Environment/Versions Spirent TestCenter. Answer Go to our Downloads site and follow the steps below: Set the Release Type to Archived Release. Set the Product Line to Spirent TestCenter. Check the Applications option under Categories. Select the Operating System that matches the one in the computer in which you're going to install the Spirent TestCenter Application option under Operating System. Select the Release from the Filter by Release drop-down list. Download the Spirent TestCenter Application. If you want to download the latest release go to FAQ20018.   NOTE: You need to log into the CSC to be able to get to the Downloads section.