Since this is homebrew, you won't find it on the PlayStation Store. Here is the standard installation process:
For those who grew up with the PSP, the tactile feel of the plastic, the click of the D-pad, and the whir of the UMD drive are powerful subconscious anchors. Using the device for hypnosis taps into the relaxed state you felt as a teenager gaming in your bedroom. Hypnotism 2 Psp
The original "Hypnotism 2" has become abandonware. Due to its age, you will likely find it on archive sites or PSP homebrew repositories. Look for a file named Hypnotism_2_PBP.rar or similar. The core file is usually EBOOT.PBP . Since this is homebrew, you won't find it
The idea of mind control, as depicted in Hypnotism 2, is a fascinating and often misunderstood concept. While it's not possible to control someone's mind against their will, hypnosis can be used to influence a person's thoughts, feelings, and behaviors. The original "Hypnotism 2" has become abandonware