This is incorrect report. Try to contact the producer of Avira or add ‘EEP Train Simulator Mission’ to the programme’s exceptions:
http://www.addiscovideo.de/avira-antivir-ausnahme-von-dateien-machen/id=1370
Home » 8. EEP Train Simulator Mission » 8.1 Installation and Deinstallation » Avira AntiVir says “TR/Crypt.TPM.gen” is a virus and the game cannot be launched