We check this website, now lumion3d.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is lumion3d Down Right Now? - NO! lumion3d is up!
If you have problem with access to site lumion3d, and domain lumion3d.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).