Şeytan
Wikipedia says: Şeytan is a 1974 Turkish cult horror film that is plagiarized off of William Friedkin’s The Exorcist (1973), directed by Metin Erksan.
The film was apparently shot with a low budget, resulting in a grainy and poor image quality, and is essentially a shot-for-shot remake of The Exorcist, with only minor differences. Şeytan was out of print until 2007, when it was released in DVD.
To watch it free, visit Archive.org.