Full explained and working solution:
1) open vs2017 and select "Tools" -> "Extensions and Updates"
2) Under Extensions and Updates select "Online" on the left of the window and on the right type in search box "Visual Studio Installer Projects Extension" hit enter and it is the first download in result (attached image) select this result "Microsoft Visual Studio 2017 Installer Projects" and click on "Download"
3) You will have to restart your VS2017 for the installation to happen so click on "close" button then restart you VS2017 then you should have it!
4) To use it you right click on your "Solution abc" then "Add New Project" under "Other Project Types" select "Visual Studio Installer" as I did in this attachment below.
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