hi,
You’ll need to login to the technet.microsoft.com site with your LIVE ID associated with your TN Subscription . Then you can download ISO file from subscription .You can refer this document:
https://blogs.technet.microsoft.com/uspartner_ts2team/2011/01/28/where-to-download-sbs2011-standard-for-installation/
technet.microsoft.com site
https://technet.microsoft.com/en-us/
If you are Microsoft Partner, ISO are available for download through Microsoft partner digital distribution site:
https://blogs.msdn.microsoft.com/mssmallbiz/2011/04/14/microsoft-windows-small-business-server-2011-now-available-for-download-through-microsoft-partner-digital-distribution-site/
If you have other question you can contact me at this forum
https://social.technet.microsoft.com/Forums/windowsserver/en-US/ef54bfc4-147d-4aa0-8af9-9c3e52e7d39e/windows-server-2012-essentials-iso?forum=winserveressentials
BEST REGARDS
Andy YOU
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