Because the term "install" is used, the content is likely one of the following:

, which usually contains specific instructions for that studio's releases.

the assets to the appropriate library folder if the content is meant for a specific media player or 3D engine.

Based on the naming convention, this string refers to adult-oriented content—specifically a digital release from a studio known as "Sperma Studio," likely featuring performers named Miss Loly and Rosella, dated May 18, 2018. Understanding the File Type