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Certain software suites or older enterprise applications hardcoded a requirement for Flash 11.5.

Yes, though very specific:

A massive project dedicated to preserving web games. It provides a secure, self-contained launcher that runs thousands of Flash games locally using its own secure sandboxed players, eliminating the need to modify your system's web browsers.

Only if you use Internet Explorer mode in Edge or install the Flash Player ActiveX control (not recommended for security). The standalone projector works fine on Windows 11.