Uninstall existing scenery
Nobody said anything about uninstalling anything. It's enough you
run ANY installer, including the Stand-Alone Addon Manager installer, so you don't have to reinstall anything else.
Install new x86 VC++2013 runtime libs
Only if you don't have them installed already, and if you download the updated Stand-Alone Addon Manager, it comes with the x86 VC++2013 runtime libraries and it will install them automatically.
Apply P3D Hotfix from LM
That's unrelated to our stuff, you can do it or not, before or after, it's no longer an issue now, since the updated Addon Manager will work with either version, patched or not.
So, it's way easier than what you listed, and it boils down to:
1) Run ANY FSDT installer you already have. If you already had the VC++ 2013 runtimes installed in your system, it will work right away, even if your installer is not the latest version, because they *all* download the very latest Addon Manager files from our site when they run.
2) Download and install the updated Stand-Alone Addon Manager, so you don't have to wonder which version of the VC++ libraries you need or where to download them, because they come with it.
Step #2 is ONLY needed if you don't have the VC++ 2013 runtimes installed in your system, or you don't know, or you don't want to have to wonder about the issue.