If the activation window for your new plugin doesn't show up automatically for whatever reason, then your license hasn’t been activated and your instrument plugin won’t be recognized by your DAW. To ensure the correct license activation, you will need to use the dedicated application "iLok License Manager". Please follow the steps below:
After successful activation, launch your DAW again and see if the plugin is recognized. If it still doesn't appear, then your DAW had probably added it to its blacklist while it wasn't able to detect its license. Learn how to tell your DAW to reconsider the blacklisted plugin in this article: Force-scan the instrument plugin if it was added to your DAW's blacklist