Flash Player's end of life (EOL) is on December 31, 2020. Past this date, major browsers will disable Flash entirely. Several of the games on https://ddrkirby.com, https://cocoamoss.com, and https://ddrkirbyisq.itch.io rely on Flash to run in-browser, which will no longer function past this date.
The following downloadable game archive provides downloadable versions of all such games, as well as methods for running them locally. Windows, Mac (OSX), and Linux are all supported through various means.
This is a combined download for Windows, Mac (OSX), and Linux. Please see the included README.txt file for full instructions.