How to get Celestia?

Could you please explain in detail the steps involved in obtaining Celestia? I'm particularly interested in knowing what prerequisites are necessary, as well as any specific strategies or tips that might make the process smoother. Additionally, I'd like to understand any potential challenges or obstacles that might arise during the acquisition process. Could you also clarify if there are any alternative methods or shortcuts to acquiring Celestia, and if so, what are they? Thank you for your assistance in this matter.