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Trend Micro Apex One documentation includes the following:

Trend Micro Apex One Documentation

Documentation
Description
Installation and Upgrade Guide
A PDF document that discusses requirements and procedures for installing the Trend Micro Apex One server, and upgrading the server and agents
Note
Note
The Installation and Upgrade Guide may not be available for minor release versions, service packs, or patches.
System Requirements
A PDF document that outlines the minimal and recommended system requirements for installing the Trend Micro Apex One server, and upgrading the server and agents
Administrator's Guide
A PDF document that discusses getting started information, Security Agent installation procedures, and Trend Micro Apex One server and agent management
Help
HTML files compiled in WebHelp or CHM format that provide "how to's", usage advice, and field-specific information. The Help is accessible from the Trend Micro Apex One server and agent consoles, and from the Trend Micro Apex One Master Setup.
Readme file
Contains a list of known issues and basic installation steps. It may also contain late-breaking product information not found in the Help or printed documentation
Knowledge Base
An online database of problem-solving and troubleshooting information. It provides the latest information about known product issues. To access the Knowledge Base, go to the following website:
http://success.trendmicro.com
Download the latest version of the PDF documents and readme at:
https://docs.trendmicro.com/en-us/enterprise/apex-one.aspx