Download of Microlux 5.50 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The most popular version of the software 5.5. This free program was originally developed by LuxArt. Microlux is categorized as Photo & Graphics Tools.
From the developer:
This version, based on Microlux Professional allows to create a complete and exact plan with all the necessary paperwork. The main difference from the full Microlux Professional version are that it offers only a plan view and do not show any beam of light representation.
You may want to check out more software, such as Montagne, ImageVisu or ZoomMagic, which might be related to Microlux.