Hi, The Ice Queen, you have to unzip the other rar file which is also named Sweet Dreams (in) Sanitarium. That also has been unzipped next to the two files you saw.
Viewing post in Sweet Dreams: (In)Sanitarium (*OLD*) comments
1st: extract the file you downloaded.
2nd: inside THAT file, you'll find another 3 files. Ignore the screenshots folder and the 'Miembros del equipo, escuela y contacto' text. You have to extract the other 'Sweet Dreams (In)Sanitarium.rar' file.
3rd: inside this last file, you'll find the Sweet Dreams (In)Sanitarium application. You have to run that.