Merge PR mumble-voip#5059: DOCS(installer): Fixup and extend installe…

…r build documentation

docs/dev/build-instructions/build_installer.md

@@ -2,9 +2,16 @@
 
 Currently, the installer creation has been tested on Windows only.
 
-For creating the installer, [WixSharp](https://github.com/oleg-shilo/wixsharp/releases) has to be present on your system. Please see the following [README](https://github.com/oleg-shilo/wixsharp/blob/master/README.md) for install information.
+For creating the installer, [WixSharp](https://github.com/oleg-shilo/wixsharp) has to be present on your system.
 
-An installer can be created after invoking cmake with the `-Dpackaging=ON` and `-Dtranslations=OFF` options, and building. This creates a *single-language* installer.
+1. Download the [latest WixSharp release](https://github.com/oleg-shilo/wixsharp/releases)
+2. Extract into a folder
+3. Add that folder to the PATH environment variable
 
-To create a *multi-language* installer, make sure the following option is set `-Dpackaging=ON` and (re-)run the cmake configure step. Multi-language packaging is the default.
+The cmake option `packaging`, off by default, specifies whether or not to build the installer. If being built it will be multi-lingual by default. 
 
+Use the cmake generate option `-Dpackaging=ON` to enable building the installer.
+
+Use the additional cmake generate option `-Dtranslations=OFF` to build a single-language installer instead.
+
+Note that the installers expect some components to be built. For example, the client installer expects the `g15` component to be built too. Without it packaging will fail on the missing expected file.