The SourceForge Avidemux File Archive hosts the original avidemux_2.5.6_win64.exe installer.
Reliable software mirrors like FOSSHUB and VideoHelp maintain historical versions specifically for users needing the 64-bit Windows installer. Key Features of the 2.5 Branch
Handles AVI, DVD-compatible MPEG files, MP4, and ASF using a wide array of codecs.
Because it is an older release, you should download it from verified mirrors to avoid bundled adware or malware.
Released as a significant milestone in the software's history, the 2.5 branch introduced several features that remain functional for basic tasks:
