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MathCAD version prior to Prime 7 are no longer available.
MathCAD version prior to Prime 7 are no longer available.
While this is true, you can use the free version of Mathcad Prime 8 (latest version) to open documents produced in Mathcad Prime 5.
https://www.mathcad.com/en/try-and-buy/mathcad-express-free-download
Edit: Quick note that Mathcad Express (free version) should not be used for commercial purposes, though that restriction doesn't apply to the 30-day trial licence. If you need it for commercial purposes, please contact PTC to purchase a licence.