On the File tab, click Preferences and navigate to the Plugins category.

Click the Spell Check plugin, then click Setup

The Spell Checker setup dialog will appear

Click Add Dictionary, then navigate to the folder that you downloaded the dictionary to

Next, these must be activated. On the File tab, click Preferences, and navigate to the Plugins catogory.

Select Spellcheck, and click Setup. Ensure that the new dictionary present, check the tickbox, and then click OK

The Spellchecker is now setup to work in the newly selected language.

The OXT file(s) will need to be added to two places, the dictionaries folder in the Editor's Program Files folder, and the Editor's AppData folder. If your setup is standard, the Program Files folder can be found under C:\Program Files\Tracker Software\PDF Editor\Dictionaries

While the AppData folder is found under %appdata%\Tracker Software\PDFXEditor\3.0

Note: You may need to create a Dictionaries folder manually, to do this right click and select New Folder or press Ctrl+Shift+N

Next, these must be activated. On the File tab, click Preferences, and navigate to the Plugins catogory.

Select Spellcheck, and click Setup. Ensure that the new dictionary present, check the tickbox, and then click OK

The Spellchecker is now setup to work in the newly selected language.