I have the same problem with display Chinese characters too. About the “Chinese language pack”, is it free after I have purchased the Pro version?
On the other hand, if “Using custom fonts” method, will it make the file size of the pdf invoice much larger than an English invoice? is there a great difference in file size between the invoice contains 500 Chinese characters (mainly in the terms and conditions section) and only a few Chinese characters(the terms and conditions most in English)