Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
The trial version doesn't include the mergeDocx method. You can use addDOCX to add a DOCX but it use the altChunk tag so it's only compatible with Word.