Where can you find SMBX 1.4?
Nintendo called Redigit, the creator of SMBX, and told him to
shut SMBX down. So he did. So, unless someone can find out how to
use SMBX's codes and add new stuff without custom graphics, PLUS
put a download link on the internet without Nintendo shutting it
down, there will never be an SMBX v1.4.