We do not have a download file for the latest version (8.1.1), but you can try downloading it from the developer's site
Download version 5.0.50 from Software Informer
Scanned by 7 antivirus programs on Sep 2, 2020.
The file is clean, see the report.
Version: 5.0.50 (x86)
Date update: Feb 14, 2016
File name: q-sys_designer_installer_5.0.50.zip
Size: 434 MB
