After you have uninstalled a previous Rumba+ version, ensure that Windows Installer is resident on client computers before installing the current version of Rumba+. If Windows Installer is not installed, you must install it.
Installing Windows Installer requires administrative rights on client computers. To install Windows Installer, use the installer setup program, InstMSI.exe.
You can also create a program dependency in an SCCM deployment package which installs the Microsoft Installer service immediately before a Rumba+ installation, on an on-demand basis.
You can download the Microsoft Installer SDK from: https://www.microfocus.com/docs/links.asp?nx=platsdk