I\'ve created setups for all my Delphi tools with Inno Setup for years. Now some users rather want an MSI installation package, so they can deploy the setups from a central
Google "Freeware MSI installer".
e.g. https://www.advancedinstaller.com/
Several options here:
http://rbytes.net/software/development_c/install-and-setup_s/
Though being Windows, most are "shareware" rather than truly free and open source.