A downloader UI can do the trick, just download a small .exe (few kb) that gives you a nice downloader, that works also as menu to launch, for each project.
Don't trust any downloader! Never
*.exe files are blocked by browsers, security programs + firewall in case of downloader. So user get 3x warning which increase paranoia
I dont like installers for small apps or games, just packages like rar or zip are fine.
App Store? Google Play? =)
Never is not the word, but depends from where you grabbed the downloader.
Or these are that bad really... maybe yes.
Online Package Manager is a downloader also. It downloads the sources and then compiles them, but I think it can be trusted (except for the update from developer site button)...
Maybe an OPM for sample projects will be good.