Update manual update section to mention deleting core mods (#269)

When manually updating Northstar, core mods should still be deleted first.
This prevents issues in case a script file is removed in a Northstar update.

docs/installing-northstar/manual-installation.md

@@ -5,6 +5,10 @@
 
 Firstly, note that the Northstar client is only available on PC and requires you to **both own the game and have it installed**.
 
+{% hint style="info" %}
+If you're looking to update Northstar, read [this](./manual-installation.md#updating-northstar) instead.
+{% endhint %}
+
 1. Download the latest version of Northstar from the [releases](https://github.com/R2Northstar/Northstar/releases) page
 2. Copy all the files in the newly downloaded zip folder to your `Titanfall2` folder.\
    ![Drag and drop the contents of the zip into your Titanfall2 folder](../images/manual-install-drag-drop-files.png)\
@@ -33,7 +37,9 @@ Should you notice any issues/warnings/errors while running Northstar, check the
 
 ## Updating Northstar
 
-To update, simply follow the same process you used to install Northstar using the newest zipped release of Northstar. When copying the new files make sure to select "_Overwrite_".\
+To update, first delete the core mods (`Northstar.Client`, `Northstar.Custom`, and `Northstar.CustomServers`) from `Titanfall2/R2Northstar/mods`.
+Then, simply follow the same process you used to install Northstar using the newest zipped release of Northstar.\
+When copying the new files, if prompted, make sure to select "_Overwrite_".\
 Note that if you modified some files like `ns_startup_args.txt`, these will also be overwritten. If you want to keep the changes you made make sure to make a copy of these files beforehand and change them back after applying the update.
 
 ## Installing Northstar mods manually