Install Odin Inspector as a Unity package

If desirable, you can install Odin in your project as a Unity package. Some advantages of this are that you can have Odin installed at just one location on your computer and leave you with less clutter in your project.

You can follow the steps below to install Odin through the package manager successfully:

1. Make a folder anywhere that is outside the Assets folder, and create a package.json file inside it:

   {
       "name": "odininspector",
       "displayName": "OdinInspector",
       "version": "3.0.6",
       "unity": "2018.3",
       "keywords": [
       ],
       "category": "Unity"
   }
   

   ( Remember to update the version field to whatever version of Odin you are installing as a package. )

2. Copy over the Sirenix folder and put that in there as well.

3. Open the package manager and find the Add Package From Disk button. (The plus button at the top left of the package manager window.)

4. If you are not running Odin in Editor Only Mode, create a new file called link.xml somewhere in your project under the Assets folder, and add the following contents to the file:

   <linker>
          <assembly fullname="Sirenix.OdinInspector.Attributes" preserve="all"/>
          <assembly fullname="Sirenix.Serialization.Config" preserve="all"/>
          <assembly fullname="Sirenix.Serialization" preserve="all"/>
          <assembly fullname="Sirenix.Utilities" preserve="all"/>
          <assembly fullname="Sirenix.Serialization.AOTGenerated" preserve="all" ignoreIfMissing="1"/>
   </linker>
   

   This step will ensure that Odin's assemblies are not stripped by Unity on AOT platforms (stripping will break Odin's serializer), and is necessary because Unity does not support link.xml files in packages and so will ignore the link.xml files included in the Odin package by default (see Unity's docs).