The official installation instructions are here: Deploying IBM Maximo Collaborate - IBM Documentation
NOTE: The official product name is now Collaborate. In 9.X, the only feature remaining is the remote collaboration feature. The other functionality in Assist 8.X versions like document ingestion used Watson Discovery which was removed. If you're upgrading from a 8.X install to 9.0 you must remove the Watson discovery which IBM support will help walk you through.
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Steven Shull
Naviam
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