The version 4.13 you're interested in is presumably a specific iteration of Dialux evo, which has seen several updates and improvements over time. The latest versions offer more features, better performance, and compatibility with newer operating systems.
The search results were a graveyard of 2010-era forums and sketchy file-hosting sites. He clicked a link on a site called Soft-Arch-Vault , a page populated with more flashing "Download" buttons than actual text. One specific link caught his eye: .
: Since the manufacturer no longer hosts 4.13 on their main site, users typically find it on archive sites like System Requirements for DIALux 4.13
Since the software is already free, a "crack" provides no additional features and only adds risk. Download DIALux lighting design software
Because it is older technology, the requirements are modest compared to modern 3D CAD software: Operating System : Windows XP (SP2), Vista, 7, 8.1, and 10 (32/64 bit).