Hi scott
It is important that all the files are in a new folder before starting the LSH3-2015 installation.
In the tutorial it is called LSH3Split.
It is also important to uninstall your previous SH3 installation and then use a registry cleaner before re-booting and re-installing.
It is a good idea to make at least 1 game copy from the installation so you do not need to use the dvd again.
You can run 1 other SH3 game without using multi SH3 as LSH3 does not use the SH3 saved games folder.
Peter
