OCR Reader utilizes Tesseract engine which supports more than 100 languages. In order to install new OCR languages, go to https://github.com/tesseract-ocr/tessdata and download the trained data file for your language. Then, copy the .traineddata file to the proper location like C:\Users\[USERNAME]\AppData\Roaming\VOVSOFT\OCR Reader\tesseract\tessdata.