TMOG 1.0.0 moved the site under /rtm/ and publishes each Linux tarball
under a versioned name with a .sha256 sidecar. The versionless
/downloads/TMOG-Task-Manager-Linux-x86_64.tar.gz path the hook fetched
now returns 404, so every upstream sync since 1.0.0 has failed.
Point source=() at the versioned tarball and have the hook read the
version from /rtm/version.txt and the checksum from the sidecar, which
drops the 8 MB download and the directory-name check the mutable URL
needed.