The best way to be sure you always have the latest VHDL Mode release
is to join the vhdl-mode-announce mailing list. If you are a
brave soul, and wish to participate in beta testing of new releases of
VHDL Mode, you may also join the vhdl-mode-victims mailing
list. Send email to the maintainer reto@gnu.org to join
either of these lists.
The official Emacs VHDL Mode Home Page can be found at https://www.iis.ee.ethz.ch/~zimmi/emacs/vhdl-mode.html.