: DIAL officially stopped offering DIALux 4 for download in 2023. It is considered outdated and does not support modern BIM workflows.
is the most recent stable release (as of late 2025/early 2026), featuring improved BIM integration and IFC export. Legacy DIALux 4: dialux 43 download link
Searching for (often referred to as 4.3 due to versioning confusion) can be tricky because the developers have shifted focus to the newer DIALux evo . However, many professionals still prefer the "Classic" version for its fast calculation times and specific features like emergency lighting or outdoor planning. Official Download Link : DIAL officially stopped offering DIALux 4 for