There was a download of Neat Video Demo plug-in for After Effects 4.1 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This software is a product of Neat Video team, ABSoft.
The software lies within Multimedia Tools, more precisely Editors & Converters. We recommend checking the downloaded files with any free antivirus. The latest version of the program can be downloaded for PCs running Windows XP/XP Professional/Vista/7/8/10/11, both 32 and 64-bit. The most popular versions of the tool are 4.1, 4.0 and 3.6.
From the developer:
Neat Video is a video filter designed to reduce visible noise and grain in video footage produced by digital video cameras, camcorders, TV-tuners, and digitizers of film or analog video. The plugin is available for various video editing applications including Adobe After Effects, VirtualDub, Pinnacle Studio, Edius, and more.
You may want to check out more software, such as Neat Video plug-in for Edius, Neat Video Demo plug-in for Vegas or Neat Video Demo plug-in for Virtual Dub, which might be similar to Neat Video Demo plug-in for After Effects.