It is possible that the PRSPInstaller folder gets deleted after PRS+ has been installed. It should be located in the root directory of the Internal Memory. It is also possible to copy it there from the PRS+ installation zip file.
But one thing to note, which I didn't mention in my earlier post, is that while this method does remove PRS+, it doesn't reflash the reader. So if you were trying to completely clean up the reader, you would still need to reflash the reader with the latest Sony firmware.
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