Ah I see. Yes EyeAdvanced should have URP compatibility!
1. First you setup your scene/project for URP.
2. Then import EyeAdvanced into your project.
3. Once import is complete, go to the EyeAdvanced/_SRP folder and double-click the URP package files. This will replace the relevant shaders/materials with URP-compatible versions.
Then you can take the EyeAdvanced prefabs and add them into your scene/character.
After performing the above do you still have problems in 2020.2? If so, can you look at your URP settings and tell me which version of URP you are using? The current version of EyeAdvanced is tested with URP version 7.1.8.