There have been updates to the extensions released since you posted this:
Data Bridge 1.2.1
Design Extender 1.2.0
Free Tools 1.1.2
Please uninstall the texting versions, then install the new ones in the extension manager.
After the install is completed in the extension manager, open DW, this should start the WebAssist installer. If the WebAssist installer does not start automatically, open a php page to force it to start. After the webAssist installer completes, make sure to restart DW before trying to use the extensions.