Reviewed installation guide

libraries/README.md

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+REQUIRED LIBRARIES
+==================
+
+This directory should be used to place downloaded libraries. This will allow you
+to more easily update **SuiteDesk** core files. Download and install:
+
+### PDF tools
+
+**wkhtmltopdf support**
+
+The print PDF module requires the use of an external PDF generation tool. The
+currently supported is *wkhtmltopdf*. To install follow the next steps:
+
+1. Download *wkhtmltopdf* from https://wkhtmltopdf.org/downloads.html/. You can
+   choose to download the source and compile it or simply download the static
+   binary, which doesn't require you to compile anything. Note that the compiled
+   version may require a running X server (static uses patched libs that can
+   work without one).
+2. Place the `wkhtmltopdf` executable into the `libraries` directory. You can
+   also place a symbolic link to the executable.
+3. Check https://wkhtmltopdf.org/usage/wkhtmltopdf.txt for further information.
+
+**TCPDF support**
+
+Used by the invoices module. This module requires TCPDF >= 6.2.000.
+
+1. Download TCPDF from http://sourceforge.net/projects/tcpdf/.
+2. Extract the contents of the downloaded package into the `libraries`
+   directory. There is no need to modify the `config/tcpdf_config.php` file, as
+   the module self-configures TCPDF.
+3. Grant write access to the `cache` and `images` directories to your webserver
+   user.
+4. Check http://tcpdf.sourceforge.net/ for further information.
+
+### HTML Purifier library
+
+Make sure you check *HTML Purifier* and make sure that you have fulfilled all of
+its requirements before running this. Specifically, you'll need the PHP
+extension `ctype` (in almost all PHP distributions), and it's nice to have `dom`
+and `iconv`.
+
+Download HTML Purifier from http://htmlpurifier.org/. You will need 4.8.0 or
+later. Extract the `library` folder to `libraries` directory. The final setup
+should be:
+
+      libraries/htmlpurifier/
+        HTMLPurifier
+        HTMLPurifier.autoload.php
+        HTMLPurifier.auto.php
+        HTMLPurifier.func.php
+        HTMLPurifier.includes.php
+        HTMLPurifier.kses.php
+        HTMLPurifier.path.php
+        HTMLPurifier.php
+        HTMLPurifier.safe-includes.php
+
+### dhtmlxGantt library
+
+Download dhtmlxGantt from https://dhtmlx.com/docs/products/dhtmlxGantt/. You
+will need 3.2.0 or later. Extract the `codebase` folder and rename it to
+`dhtmlxgantt` in the `libraries` directory. The final setup should be:
+
+      libraries/dhtmlxGantt/
+        connector
+        ext
+        locale
+        skins
+        sources
+        dhtmlxgantt.css
+        dhtmlxgantt.js