there is a free version on F95zone that has the most recent update
i checked and couldnt find it, found another porn game with some epic music tho Somniphobia v1.0 by Towerfag (itch.io)
lewdgames also has a free full version up to 6.1 i think. but even then i strongly recommend looking up the cheat codes, because the grinding required to unlock anything is absurd and the combat without max stats is unplayably imbalanced. Don't be fooled by a page update on itch, it's never gonna change from the 1.0 demo version here.