Clarify package availability per platform

Author: eelstork

README.md

@@ -49,7 +49,12 @@ This means better performance (low/no GC), cleaner syntax and the freedom to str
 
 ## Installation
 
-`dotnet add package ActiveLogic` (via [NuGet](https://www.nuget.org/packages/ActiveLogic/))
+Engine/platform agnostic:
+- `dotnet add package ActiveLogic` (via [NuGet](https://www.nuget.org/packages/ActiveLogic/))
+
+Unity 3D:
+- Standard Edition [via the Unity Asset Store](https://www.assetstore.unity3d.com/#!/content/151850)
+- Active-LT [via UPM on Github](https://github.com/active-logic/active-lt)
 
 From source: no dependencies.
 
@@ -60,7 +65,7 @@ From source: no dependencies.
 ## License
 
 - GNU Affero GPL v3.0. TLDR, use the software freely, *provided derivative works are free, open source*.
-- Full-featured Unity integration [via the Asset Store](https://www.assetstore.unity3d.com/#!/content/151850); a free Unity integration is also available [here](https://github.com/active-logic/active-lt/)
+- Full-featured Unity integration [via the Asset Store](); a free Unity integration is also available [here](https://github.com/active-logic/active-lt/)
 - Pending a standalone commercial license, read [here](Doc/Commercial.md)
 
 ## Where next?