Downloading Aquadopp 1.40.16 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. This free program was originally developed by Nortek AS.
The program lies within Education Tools, more precisely Science Tools. The most popular version among the software users is 1.3. AquaDopp.exe is the default file name to indicate the Aquadopp installer. We recommend checking the downloaded files with any free antivirus.
From the developer:
Aquadopp can measure wave height, period, and direction using what is commonly referred to as PUV processing. This means that the 2D velocity (U and V) is measured at 1 Hz intervals along with the pressure sensor (P) and later processed with the Nortek QuickWave or Matlab routines that can be downloaded from the Nortek forum
You may want to check out more software, such as Nortek File Converter, which might be related to Aquadopp.