Adrian Wenz at Binary Space informs me that SpaceMissions™ is now available in the Microsoft Store. SpaceMissions™ is

a 3D Solar System & Space Missions Simulator supporting most Earth-centric spacecraft as well as some selected interplanetary missions (like MSL, Rosetta, OSIRIS-REx and more): Travel through our Solar System, visit planets, comets, asteroids and watch critical maneuvers of interstellar probes at any time from any desired perspective.

Adrian tells me that the program will be further improved in a “step by step by adding more space missions (e.g. Insight), features and by removing any detected bugs”.

Here is a clip showing some of the features of the program (which was referred to as SpaceTraveller during its development):

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