fix stuff in downloads

content/downloads.md

@@ -7,5 +7,20 @@ description = "The page to get Additive from"
 
 If you don't want to install any third-party stuff, you can use the Additive installer which lets you select a version to download and install to the Minecraft launcher. This is an unofficial installer made by Gaming32 - please go [here](https://github.com/Gaming32/additive-installer/issues) to report issues and suggest features for it.
 
+Here are the different downloads (links will be available soon):
+
 - '.exe' variant (Windows)
-- '.jar' variant (Linux, MacOS, etc)
+- '.jar' variant (Linux, MacOS, etc)
+
+# Installing with third-party launchers
+
+If you prefer to use a third-party option such as Prism Launcher, ATLauncher, or anything else that supports Modrinth modpacks, simply [follow the instructions from Modrinth](https://docs.modrinth.com/docs/modpacks/playing_modpacks/).
+
+Assuming you [already have it set up](https://prismlauncher.org/wiki/getting-started/installing-prismlauncher), here's the instructions if you are on Prism Launcher, which is what I personally recommend and use:
+
+1. Click "+ Add Instance"
+2. Click the "Modrinth" tab
+3. Select either Additive for performance and OptiFine features, *or* Adrenaline for strictly performance features.
+4. Select the version you want at the bottom left of the dialog.
+5. Click "OK" to start installing.
+6. Open the instance to play!