The Gideros installer package is now bigger that 1GB, after looking at the files, the "All Plugins" and "Templates" takes the most space. the "Templates\VisualStudio" contains WinRT files about 600MB, "Templates\Xcode4" about 560MB, and "All Plugins" contains some big plugins that's not frequently used, like "harfbuzz\bin\WinRT".
To use WinRT(or UWP), I need to install Visual Studio, too, so is those Mac/Apple templates, you need a MAC and dev account to use it.
I suggests to split the files as optional or download on demand. I can do this my own, but with the frequent update cycle, I have to do it over again, and the installer is significantly much bigger that it was before.