Why was there not a note: If you have CSS Form Builder 2 installed, you will not need to install Universal Email 4. I Didn't know this and spent $100 on UE4 for nothing!
Anyway, below is taken from a chart I developed yesterday to organize all info of what I originally installed in DW CS5.5 with notes. Where I have "Bookmark Fix" I am aware of the extension fix. The "Do Not Install" are the extensions I know not to install.
Communication Toolkit for Skype 1.0.3
Cookies Toolkit 3.1.3 Bookmark Fix
CSS Form Builder 1.0.2 ‎Please note: CSS Form Builder includes all the functionality of the older Validation Toolkit. If you own Validation Toolkit and it is currently installed, you will need to uninstall the extension from the Adobe Extension Manager prior to installing CSS Form Builder.
CSS Menu Writer 2.0.5
CSS Sculptor 3.0.2
DataAssist 2.0.8 Please note: This version of DataAssist includes all the functionality of the older Database Search. If you have Database Search installed, you must remove it completely before installing DataAssist. Bookmark Fix
Database Starter Kit for PHP 1.0.1
Digital File Pro 2.0.4 " DO NOT INSTALL"
Dreamweaver 8 Recipes Extension 2.1.0
Dreamweaver Tools for Google 2.0.4
Dynamic Dropdowns 2.7.5
Dynamic Web Charts 1.0.5
eCart 5.0.3 Bookmark Fix
eCommerce mySQL Database 1.0.0
eCommerce Recipes 3.0.0
Eric Meyer's CSS SCULPTOR 3.0.2
Form Toolkit 1.0.0
HTML Editor 2.0.2 Please note: HTML Editor includes all the functionality of the older iRite. If you own iRite and it is currently installed, you will need to uninstall the extension from the Adobe Extension Manager prior to installing HTML Editor.
iRite 1.0.3 " DO NOT INSTALL"
Jeffrey Zeldman's Web Standards Advisor 1.0.2
PayPal eCommerce Toolkit 4.5.4
PayPal eCommerce Toolkit Recipes 1.0.0
PowerCMS 1.0.2 Bookmark Fix
Pro Maps for Google 1.0.7
Search for BOSS 1.0.1
Site Import 3.0.4
SiteAssist Professional 1.0.9
Social Media Toolkit 1.0.0
Universal Email 4.0.1 Please note: This version of Universal Email includes all the functionality of the older Digital File Pro. If you have Digital File Pro installed, you must remove it, and any older version of Universal Email, completely before installing this product. Fix 400 and 401
Validation Toolkit Recipes 1.2.0 " DO NOT INSTALL"