[1] https://www.wherry.com/gadgets/retrocomputing/vax-simh.html
http://www.openvmshobbyist.com/news.php
You can sign up as a hobbyist here:
http://plato.ccsscorp.com/hobbyist_registration.php
someone will email you in the next day or so with a license installer and the URLs to download the software.
Also they have the Alpha version of OpenVMS available.
[1] https://www.wherry.com/gadgets/retrocomputing/vax-simh.html