Reproduction steps:
1. Create a new HDRP template project
2. Open the Package Manager window to check if HDRP 7.1.1 or above is installed
3. Install Hybrid Renderer package
4. Observe the console window

Expected result: No errors are thrown
Actual result: 4 errors regarding LightConversion and Light System are thrown

Reproducible with: 2019.3.0b4, 2019.3.0b7, 2020.1.0a9
Not reproducible with: 2017.4.33f1, 2018.4.11f1, 2019.2.10f1, 2019.3.0b3(HDRP 7.1.1 or above were not available)

Package versions tested: 0.0.1-preview.13, 0.1.0-preview, 0.1.1-preview

Notes:
1. The issue is caused when HDRP 7.1.1 or 7.1.2 is installed. No errors are thrown with HDRP 7.0.1 when Hybrid Renderer 0.1.1 is installed