Merge pull request #3829 from TerryGLee/tglee-vsinstall

[install] add caveat about Download All Then Install feature

Author: PRMerger8

docs/install/create-an-offline-installation-of-visual-studio.md

@@ -1,7 +1,7 @@
 ---
 title: "Create an offline installation"
 description: "Learn how to install Visual Studio offline when you have an unreliable internet connection or low bandwidth."
-ms.date: 01/15/2019
+ms.date: 02/06/2019
 ms.custom: "seodec18"
 ms.prod: visual-studio-dev15
 ms.topic: conceptual
@@ -18,7 +18,7 @@ ms.workload:
 ---
 # Create an offline installation of Visual Studio 2017
 
-We designed Visual Studio 2017 to work well in a variety of network and computer configurations. While we recommend that you try the [Visual Studio web installer](https://visualstudio.microsoft.com/downloads/?utm_medium=microsoft&utm_source=docs.microsoft.com&utm_campaign=button+cta&utm_content=download+vs2017)—which is a small file and allows you to stay current with all the latest fixes and features—we understand that you might not be able to.
+We designed Visual Studio 2017 to work well in a variety of network and computer configurations. While we recommend that you try the [Visual Studio web installer](https://visualstudio.microsoft.com/downloads/?utm_medium=microsoft&utm_source=docs.microsoft.com&utm_campaign=inline+link&utm_content=download+vs2017)—which is a small file and allows you to stay current with all the latest fixes and features—we understand that you might not be able to.
 
 For example, you might have an unreliable internet connection or one that has low bandwidth. If so, you have a few options: You can use the new "Download all, then install" feature to download the files before you install, or you can use the command line to create a local cache of the files.
 
@@ -27,11 +27,15 @@ For example, you might have an unreliable internet connection or one that has lo
 
 ## Use the "Download all, then install" feature
 
-[**New in 15.8**](/visualstudio/releasenotes/vs2017-relnotes?context=visualstudio/default&contextView=vs-2017#install
-): After you download the web installer, select the new **Download all, then install** option from the Visual Studio Installer. Then, continue with your installation.
+[**New in 15.8**](/visualstudio/releasenotes/vs2017-relnotes-v15.8#install): After you download the web installer, select the new **Download all, then install** option from the Visual Studio Installer. Then, continue with your installation.
 
    ![The "Download all, then install" option](media/download-all-then-install.png)
 
+We designed the "Download all, then install" feature so that you can download Visual Studio as a single installation for the same computer on which you downloaded it. That way, you can safely disconnect from the web before you install Visual Studio.
+
+> [!IMPORTANT]
+> Do not use the "Download all, then install" feature to create an offline cache that you intend to transfer to another computer. It's not designed to work that way. <br><br>If you want to create an offline cache to install Visual Studio on another computer, see the [Use the command line to create a local cache](#use-the-command-line-to-create-a-local-cache) section of this page for information about how to create a local cache, or the [Create a network installation of Visual Studio 2017](../install/create-a-network-installation-of-visual-studio.md) page for information about how to create a network cache.
+
 ## Use the command line to create a local cache
 
 After you download a small bootstrapper, use the command line to create a local cache. Then, use the local cache to install Visual Studio. (This process replaces the ISO files that were available for previous versions.)