If you're looking to download the full natak (play) of "Lage Raho Gujjubhai" for free, I must inform you that it's not possible to do so legally. The movie is copyrighted, and downloading or sharing copyrighted content without permission is illegal.
While many search for a "free download," the best way to enjoy this masterpiece is through official streaming platforms to support the artists. You can often find full versions or highlights on: lage raho gujjubhai full natak download free new