Even if you download the ISO files there will be lots of stuff not included in the installer which requires connection to internet when installing, for example:. Emulators for Windows Mobile.
Windows 10 SDK. Tools for Windows 10 Universal Apps.
GitHub Extension for Visual Studio and Git CLI. C#/.NET Xamarin. Visual C Mobile Development (iOS support). Joyent Node.js. Java SE Development Kit.
Visual Studio 2010 Express Download Offline Installation Of Internet Windows 7
Visual Studio 2010 Express Download Offline Installation Of Internet Speed
Android SDK, NDK, and emulatorPerhaps some of them are not possible to include but it is annoying nonetheless. I bumped into this page 'Download #VisualStudio 2015 (ISO + Web Installer)' and the ISO link provided in this page seems to be valid.I am downloading the ISO at this very moment.Edit:Was able to download the ISO and burned into a DVD. Also tried installing (only C/C) on a 64-bit Windows 10 laptop and everything seems to work except that the installer couldn't find and had to go to Internet to download packagesvcRedistD121033vcredistx64.exe (although this file does exist in DVD and runnable).