A complete series collection (2018 edition) was released on DVD specifically featuring Greek subtitles only
You can also download just the .srt (subtitle) files and manually add them to video files you already own (e.g., from DVD or digital purchase). Popular sites include: kirgin cicekler greek subs
Always prefer official sources when available. Fan subs are fine for personal use, but distributing copyrighted content with subs may violate terms. A complete series collection (2018 edition) was released