First you would create an account and then download and install the trial software.

Below is the in-depth explanation for each operating system:

For Mac

Directly from Website

For Windows

Public User Guide - PDF Pro

Introduction

Contact Us

System Requirements

PDF Pro Trial option

Purchasing PDF Pro

Download & Install

Refund Policy

Volume Licensing

Subscription Management

Upgrade

Reset Password

Deactivate a Device

Uninstall

Log Files for Support

Error Messages

Getting PDF PRO

Your Default App

Page Viewing Tools

Opening a PDF

Context Menu

Creating a PDF

Document Properties

Header/Footer

Bates numbers

Watermark

Creating Links

Whiteout

Convert PDF to...

Intro to PDFs

Add & Edit Text

Images

Managing Pages

Forms

Rotating PDFs

How to EDIT a PDF

Stamp Markup Tool

Form - lines and shapes

Document Markup

Text Markup

View/Hide Annotations

Markup Tools

Password

Redact

Search and Redact

Sign a Document

Certify a Document

Secure the PDF

Conversion check

Convert current file

Convert an external file

Convert - Batch process

OCR - Convert to text

Bookmarks

Thumbnails

Search

Attachments

Comments

Show Clipboard

Named positions

Redaction Marks

Left navigation sidebar

Measure tools

PDF PRO User Guide