VikingStarSM-
All SimpliVity software, including the vCenter plug-in, can be found at https://support.simplivity.com.
Once logged in, the plug-in specifically can be found by selecting your model -> scrolling down to and clicking "SimpliVity Software", then clicking your OmniStack version -> scrolling down to and clicking "SimpliVity Software" and clicking on the Plug-in link.
Hopefully that helps!
Brian
~If you find this or any other post helpful, please award points. Also mark thread as answered if question was answered successfully.~
Brian Knudtson
vExpert, VCP, VCAP