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were never sold as digital downloads. Instead, the software was distributed via physical discs and required a specific serial number and an InterLink controller to operate.

References (Hypothetical):

Introduction

Because RealFlight 7.5 is discontinued, it is primarily found through secondary markets or as a legacy update: realflight 75 download hot

If you are looking for a legal way to "buy and fly" today, the current ecosystem has moved to digital distribution: RealFlight Evolution (Latest) were never sold as digital downloads