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.
If you can run PHPDocX Community version then PRO is compatible (if you'll use plugin conversion you'll need Java too). What version of PHP are you using?.