I downloaded NISDownloader.exe(version 3.1.0.14), to update to NIS2013(version 20.2.1.22). I am doing a File Insight of that file NISDownloader.exe and it was downloaded by fever than 5 users in Norton Community. I updated of NIS with that NISdownloader.exe ...
If you downloaded the file from the update center, you will get a customized version, just for you, with your key and account details embedded in the file.
The personal information is automatically used during installation to personalize and activate the product.
The file will be unique to you, i.e. 1 user, but will be signed by Symantec, so as long as the file is trusted, due to being signed by us, you are good.