Download from PortableApps.com
LameXP Portable can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the PortableApps.com Platform for easy installs and automatic updates.
LameXP is a free multi-format audio file converter that supports a variety of output formats, including MP3, AAC/MP4, Ogg Vorbis, Opus as well as FLAC, and that can read a multitude of input formats. It also supports multi-threaded batch processing.