The latest official builds of the media repo's binaries can be found on GitHub. Download the one for your platform or compile your own.

After preparing a configuration file at /etc/matrix-media-repo/media-repo.yaml (see configuration section of this documentation), something similar to the following can be run:

./media_repo -config /etc/matrix-media-repo/media-repo.yaml

Note that on Linux you may need to install libde265-dev and libheif-dev before MMR will start.