I got bi expansion for rtw now. I started out with a new install of rtw .

so do i do ?
patch 1.3 rtw
patch 1.5 rtw
install bi expansion
patch 1.6 bi

or

install bi expansion
patch 1.6 bi

I don't want my game crash to desktop so I want to do this correctly couldn't figure out from the official site.

thanks in advance.