add manual install steps to readme (removing from main guide)

src/StardewModdingAPI.Installer/readme.txt

@@ -13,7 +13,27 @@
 
 SMAPI lets you run Stardew Valley with mods. Don't forget to download mods separately.
 
-Need help? See:
-   - Install guide: http://canimod.com/for-players/install-smapi
-   - Troubleshooting: http://canimod.com/for-players/faqs#troubleshooting
+
+Install guide
+--------------------------------
+See http://stardewvalleywiki.com/Modding:Installing_SMAPI.
+
+
+Need help?
+--------------------------------
+- FAQs: http://stardewvalleywiki.com/Modding:Player_FAQs
 - Ask for help: https://discord.gg/kH55QXP
+
+
+Manual install
+--------------------------------
+THIS IS NOT RECOMMENDED FOR MOST PLAYERS. See instructions above instead.
+If you really want to install SMAPI manually, here's how.
+
+1. Download the latest version of SMAPI: https://github.com/Pathoschild/SMAPI/releases.
+2. Unzip the .zip file somewhere (not in your game folder).
+3. Copy the files from the "internal/Windows" folder (on Windows) or "internal/Mono" folder (on
+   Linux/Mac) into your game folder. The `StardewModdingAPI.exe` file should be right next to the
+   game's executable.
+4. If you use Steam, see the install guide above to enable achievements and overlay. Otherwise,
+   just run StardewModdingAPI.exe in your game folder to play with mods.