If you cannot purchase 0.990, you can still download the older, official freeware versions. All versions prior to 0.990 are intended to remain free.
A massive graphical overhaul for deep-space exploration. space engine 0.990 download free
Where to download legacy versions like 0.980? : r/spaceengine If you cannot purchase 0
In June 2019, developer Vladimir Romanyuk released version 0.990 on as a paid beta. This shift was necessary to fund more intensive development, such as: Where to download legacy versions like 0
Native integration for headsets like the Oculus Rift and HTC Vive.
While (the first paid Steam version) is not available for free legally, the history of this "universe simulator" is rooted in a long tradition of freeware. If you are looking for a free experience, the best route is to explore the legacy version 0.980 , which was the final free release before the project transitioned to a professional, paid model. The Transition: Why 0.990 is Paid