You install the backup agent in a Windows operating system. Installation fails with these messages in MSI log (C:\ProgramData\Acronis\InstallationLogs\BackupClient.msi.log):
MSI (s) (6C:34) [17:13:02:292]: Note: 1: 1336 2: 3 3: C:\Windows\Installer\
MSI (s) (6C:34) [17:13:02:292]: MainEngineThread is returning 1632