Offline Install of Visual Studio Community 2015 - Download Instructions

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Downloading Visual Studio for an offline installation
In most cases, you can install Visual Studio from the download site with no problems. However, in some cases, you may want to download all the update packages before you install them (for example, to install on multiple machines or on an offline machine). The following steps explain how to download all the update packages that you need for an offline installation.
After you download the update executable from the MSDN website to a location on your file system, run the following command at a command prompt: <executable name> /layout.
This command downloads all the packages for the installation.
By using the /layout switch, you can download all the core installation packages, not just the ones that apply to the download machine. This approach gives you all the files that you need to run this update anywhere and may be useful if you want to install components that weren't installed originally.
After you run the command, you should be prompted for the download location. Enter the location, and then choose Download.
When the package download is successful, you should see a Visual Studio screen that says Setup Successful! All specified components have been acquired successfully.
In the file location that you specified, find the executable file and the package folder. This is everything you need to copy to a shared location or install media.
You can now run the installation from the file location or the install media.