If it feels sketchy, it is sketchy. No one is giving away commercial software from 2003 without a catch.
Even if you find a "clean" crack, running software from 2003 on Windows 10 or 11 is dangerous. ACDSee 5.0 uses outdated libraries that modern antivirus may flag. More importantly, cracks often disable Windows security features to install. acdsee 5.0 free download full version
Most of these sites host the original trial installer (file name like ACDSee5setup.exe , size ~15–20 MB). That installer is not the full version—it is a time-limited trial. You still need a serial number. If it feels sketchy, it is sketchy
If you absolutely need that specific ACDSee 5.0 workflow, buy a used copy on eBay (old CDs still exist) or run a virtual machine with Windows XP. If it feels sketchy