Scriptable Render Pipeline assets in SSC require Unity 2019.4 LTS or newer.
IMPORTANT: Do not import these packages without URP/HDRP installed, else you will get many errors. 

1. Import the entire asset (e.g. Sci-Fi Ship Controller) into a project setup for URP or HDRP.
2. If using HDRP, from package manager, import High Definition Render Pipeline 7.7.1 (U2019.4.32 LTS+)
3. If using URP, from the package manager, import Universal Render Pipeline 7.7.1 or newer (U2019.4.32 LTS+)
4. From the Unity Editor double-click** on either the SSC_URP_[version] or SSC_HDRP_[version] package within this folder
5. TechDemo has its own packages, SSC_TechDemo_URP_[version] or SSC_TechDemo_HDRP_[version]. These require U2019.4.32+ or newer.
6. TechDemo3 has its own packages, SSC_TechDemo3_URP_[version] or SSC_TechDemo3_HDRP_[version]. These require U2019.4.32+ or newer.

** If double-click does not work, from the Unity Editor menu, Assets/Import Package/Custom Package... navigate to the folder within your project where the package is located to import the package.

NOTE: Celestials (stars) do not work with LWRP or HDRP as Unity do not support depth-only cameras in these Render Pipelines.
Therefore, in this release stars will not be visible in the Asteriods demo unless the built-in or URP 7.7.1+ pipelines are used.

For HDRP in 2020.x install the HRDP 7.7.1 and SSC_TechDemo_HDRP_7.7.1 packages. You may need to lower the Sun Lux from say 120000 to 80000 and reduce the Sky Exposure from say 16 to 14 in some of the demo scenes. Adjust values to suit your tastes.