Link seems to be good to me too.
what is supposed to mean by
clear out FSW_PSW .TRC and .MAN files?
Clearing them out is just opening them with notepad, deleting the text inside, then saving.
Grant@DetailAddict's comment is extremely vague, but I think he means that if something did go wrong, there is a different way of reverting back to defaults. I would copy the FSW_PSW.TRC file to another folder like I suggest, that way if something does go wrong, you can try either way.
2011 E90 335xi - Black/Black - NAV - CA - CWP - 6NR - ZSP - 18s - Harmon Kardon
Ordered 7/10/2011 | Finished Production 7/20/2011 | On Boat 8/5/2011 | Picked it up 9/3/2011
Mods: Hardwired 9500ix | CDV Delete | 15% Ceramic Tint | JB3 | Hyper White Angel Eyes
Recodes: Windows close with the fob | Dvd in motion | Removed iDrive disclaimer | Unlock doors on shutoff | Wiper autofinish | Window auto up through door opening