How to download a previous build?

Hi,
I have tried to download v11.14 or .13 from blog.dopus.com/2015/07/directory-opus-1114.html for instance but I always get version 11.15... Is it still possible ?
Thanks.

11.13:
leo.dopus.com/temp/DOpusInstall_11-13.exe

11.14:
leo.dopus.com/temp/DOpusInstall_11-14.exe