While DIALux 4.13 is older, it is still compatible with Windows 10 and 11 . However, it is no longer receiving major feature updates, as the company has shifted focus to DIALux evo.
DIALux 4.3 is a legacy version of DIALux, a professional lighting design software used to calculate and visualize indoor and outdoor lighting. It supports photometric calculations, renderings, and export of reports and plans. dialux 43 download link
Since the official link is inactive, you can find the installer through these reputable software archives: While DIALux 4