OSIRT 4.5 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. This free program was originally produced by osirtbrowser.com. OSIRT.exe is the most frequent filename for this program's installer. The following version: 3.2 is the most frequently downloaded one by the program users. The software lies within Office Tools, more precisely Document management.
From the developer:
OSIRT is a completely free application for Windows 7, 8, 8.1 and 10 that has been designed to aid law enforcement officials to perform open source research on the web. OSIRT provides built in tools for screenshots, video captures and complete webpage downloads including on the dark web. Preview screenshots and videos and document them as you go; they are automatically timestamped, hashed and logged in your case file.
You may want to check out more software, such as Citeknet CHM IFilter, AceHide Free or Document Trace Remover, which might be related to OSIRT.