As of V3.5, PHPmotion is using a new in-house player that is not compatible with Pseudo-Streaming at the time of this posting. If you wish to have Pseudo-Streaming in PHPmotion v3.5, you have several options.
All three of the above options come with Pseudo-Streaming built in so there is no need to follow the rest of the tutorial if you go with one of the above options.
If you are working with PHPmotion v3.0.x or earlier, you already have the JW Player and can continue on to the next page which explains how to install Pseudo-Streaming on PHPmotion v3.0.x. It is highly recommended however that you use PHPmotion v3.5 and the above methods, as the devs at PHPmotion will not be releasing any new bug fixes or security updates for PHPmotion v3.0.