The Symantec Data Loss Prevention - Cloud Prevent for Microsoft Office 365 Implementation and Longevity guides are attached to this article.
Data Loss Prevention Cloud Prevent for Microsoft Office 365
You are licensed for Cloud Prevent, and not the Cloud Service, and want to download legacy content that otherwise seems unavailable.
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The most recent downloadable version of a published guide for implementing the Cloud Prevent for Email is contained in the "Legacy Documentation" for the 15.7 branch:
Symantec™ Data Loss Prevention Cloud Prevent for Microsoft Office 365 Implementation Guide, Version 12.5 through 15.7