PaintTool SAI's interface language is determined by the files included with the version you install. Official SAI releases typically ship in Japanese with an English translation available; community-made language patches can add other languages. To change the language:
sai.exe (rename it to sai_jp.exe).sai_en.exe.sai.exe.Pretty late, I had the same problem, from what it looks like is that the language is called "Unicode" so just go to a file named " DeviantArt·Pein-Sempai paint tool sai change language
If you're using a Windows computer, you can also change the language in Paint Tool SAI by modifying the Windows Registry. Here's how: Back up the original sai
Edit the File: Open language.conf with a text editor like Notepad. Pretty late, I had the same problem, from
language.conf file: