The RPM repository for Redhat/Fedora can be installed with the following steps:

yum-config-manager --add-repo http://packages.gwdg.de/gwdg-tsm-client/rpm/
wget -q -O /tmp/gwdg-tsm.key "http://packages.gwdg.de/gwdg-tsm-client/rpm/repodata/repomd.xml.key"
rpmkeys --import /tmp/gwdg-tsm.key && rm -v /tmp/gwdg-tsm.key

After refreshing the package repository cache the TSm clients can be installed directly:

yum update
yum install tivsm-ba