The scene is set up to render an animation right out of the box.  Render settings and materials are specifically designed for use with the Eevee render engine. The Glare node in the compositor can cause rendering artifacts when used with volumetrics in Eevee.  Disable the glare nodes in the compositor if you experience artifacts in your render frames. Cycles can be used, but volume effects will impact rendering with Cycles dramatically.  It is recommended to use Eevee or to disable the volume effects for Cycles rendering.