Download the dictionaries
Download the dictionaries you want to use from http://www.addictivesoftware.com/dicts-extern.htm.
Extract the zip files and copy the dictionaries to the folder "Time2HELP\Spellchecking\Dictionaries".
Add the dictionaries to the spell checker.
To activate spell checking, you need to let the spell checker know where your dictionaries are located.
Open a document in the Time2HELP editor. Right click the editor and select SpellCheck Options from the pop-up menu.
In the Spell Check Configuration Dialog, click Locate Dictionaries... and locate the folder with your dictionaries, and choose the dictionary you want to use.