Dunno if it's *already* portable, but here's the fresh WinLibre@SoC 2006 baby: http://infrarecorder.sourceforge.net/
New: Zoom (May 18, 2023), Platform 25.0 (Apr 07, 2023)
New Apr 14: macOS Portable Drive Support
450+ real apps (49GB), 1.1 billion downloads, Please donate.
Dunno if it's *already* portable, but here's the fresh WinLibre@SoC 2006 baby: http://infrarecorder.sourceforge.net/
according to portable freeware