Fixes #4811 - Added instructions to install PowerShellGet without existing version installed (#4816)

* issue 4811

* fixes from PR review

Author: davidsmatlak

gallery/installing-psget.md

@@ -1,5 +1,5 @@
 ---
-ms.date:  06/12/2017
+ms.date:  09/19/2019
 contributor:  manikb
 keywords:  gallery,powershell,cmdlet,psget
 title:  Installing PowerShellGet
@@ -41,13 +41,21 @@ Update-Module -Name PowerShellGet
 Exit
 ```
 
-### For systems running PowerShell 3 or PowerShell 4, that have installed the PackageManagement Preview
+### For computers running PowerShell 3.0 or PowerShell 4.0
 
-1. From an elevated PowerShell session, use `Save-Module` to save the modules to a local directory.
+These instructions apply to computers that have the **PackageManagement Preview** installed or don't
+have any version of **PowerShellGet** installed.
+
+The `Save-Module` cmdlet is used in both sets of instructions. `Save-Module` downloads and saves a
+module and any dependencies from a registered repository. The module's most current version is saved
+to a specified path on the local computer, but isn't installed. For more information, see [Save-Module](/powershell/module/PowershellGet/Save-Module).
+
+#### Computers with the PackageManagement Preview installed
+
+1. From a PowerShell session, use `Save-Module` to save the modules to a local directory.
 
    ```powershell
-   Save-Module -Name PowerShellGet -Path C:\LocalFolder
-   Exit
+   Save-Module -Name PowerShellGet -Path C:\LocalFolder -Repository PSGallery
    ```
 
 1. Ensure that the **PowerShellGet** and **PackageManagement** modules aren't loaded in any other
@@ -60,3 +68,21 @@ Exit
    Copy-Item "C:\LocalFolder\PowerShellGet\*" "$env:ProgramFiles\WindowsPowerShell\Modules\PowerShellGet\" -Recurse -Force
    Copy-Item "C:\LocalFolder\PackageManagement\*" "$env:ProgramFiles\WindowsPowerShell\Modules\PackageManagement\" -Recurse -Force
    ```
+
+#### Computers without PowerShellGet
+
+For computer's without any version of **PowerShellGet** installed, a computer with **PowerShellGet**
+installed is needed to download the modules.
+
+1. From the computer that has **PowerShellGet** installed, use `Save-Module` to download the current
+   version of **PowerShellGet**. Two folders are downloaded: **PowerShellGet** and
+   **PackageManagement**. Each folder contains a subfolder with a version number.
+
+   ```powershell
+   Save-Module -Name PowerShellGet -Path C:\LocalFolder -Repository PSGallery
+   ```
+
+1. Copy the **PowerShellGet** and **PackageManagement** folders to the computer that doesn't have
+   **PowerShellGet** installed.
+
+   The destination directory is: `$env:ProgramFiles\WindowsPowerShell\Modules`