Hello,
i have tried multiple times but when i try to download and install wireframe sketcher 6.0.0 or 5.1.0 from your website, the setup crashes with the following error:
NSIS Error
Installer integrity check has failed. Common causes include incomplete download and damaged media. Contact installer's author to obtain a new copy.
More information at:
http://nsis.sf.net/NSIS_Error