There was a download of WinDes 12.6 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The program's installer files are commonly found as Network.exe or windes.exe etc. This program is an intellectual property of Micro Drainage Ltd. The program relates to Photo & Graphics Tools. The most popular version among WinDes users is 12.6.
From the developer:
As a modular suite, WinDes ® enables you to select the elements most suited to your immediate requirements, with the flexibility to introduce additional modules as they are needed. At the same time, the full integration of the modules means that you can produce a complete drainage system, incorporating pipes, open channels, attenuation and SUDS, in one model
You may want to check out more software, such as WIND Connection Manager, WinDS PRO or West Wind Web Monitor, which might be related to WinDes.