MSIX build instructions adjustmnet (microsoft#1170)

installer/README.md

@@ -1,24 +1,27 @@
 # PowerToys Setup Project
 
-## Build instructions
-  * Install the [WiX Toolset Visual Studio 2019 Extension](https://marketplace.visualstudio.com/items?itemName=RobMensching.WiXToolset).
-  * Install the [WiX Toolset build tools](https://wixtoolset.org/releases/) in the development machine.
-  * Open `powertoys.sln`, select the "Release" and "x64" configurations and build the `PowerToysSetup` project.
-  * The resulting installer will be built to `PowerToysSetup\bin\Release\PowerToysSetup.msi`.
+## MSIX instructions
+
+### 1-time Run
 
-## Building and installing self-signed PowerToys MSIX package
+#### Create Self-sign certificate
 For the first-time installation, you'll need to generate a self-signed certificate.  The script below will generate and add a cert to your [TRCA store](https://docs.microsoft.com/en-us/windows-hardware/drivers/install/trusted-root-certification-authorities-certificate-store). 
 1. Open `Developer PowerShell for VS` as an Admin
 2. Navigate to your repo's `installer\MSIX`
 3. Run `.\generate_self_sign_cert.ps1`
 
-## To Build
+#### Elevate `Developer PowerShell for VS` permissions
+`msix_reinstall.ps1` is unsigned, you'll need to elevate your prompt.
+1. Open `Developer PowerShell for VS` as admin
+2. Run `Set-ExecutionPolicy -executionPolicy Unrestricted`
+
+### To Build MSIX
 1. Make sure you've built the `Release` configuration of `powertoys.sln`
 2. Open `Developer PowerShell for VS`
 3. Navigate to your repo's `installer\MSIX`
 4. Run `.\msix_reinstall.ps1` from the devenv powershell
 
-### What msix_reinstall.ps1 does
+#### What msix_reinstall.ps1 does
 `msix_reinstall.ps1` removes the current PowerToys installation, restarts explorer.exe (to update PowerRename shell extension), builds `PowerToys-x64.msix` package, signs it with a PowerToys_TemporaryKey.pfx, and finally installs it.
 
 #### Removing all .msi/.msix PowerToys installations
@@ -30,3 +33,9 @@ gwmi win32_product -filter "Name = '$name'" -namespace root/cimv2 | foreach {
   else { write-warning "Failed to uninstall $name." }
 }
 ```
+
+## MSI Build instructions (Deprecated)
+  * Install the [WiX Toolset Visual Studio 2019 Extension](https://marketplace.visualstudio.com/items?itemName=RobMensching.WiXToolset).
+  * Install the [WiX Toolset build tools](https://wixtoolset.org/releases/) in the development machine.
+  * Open `powertoys.sln`, select the "Release" and "x64" configurations and build the `PowerToysSetup` project.
+  * The resulting installer will be built to `PowerToysSetup\bin\Release\PowerToysSetup.msi`.