By the time Windows 10 became the standard operating system, Flash had become a massive liability. The plugin became synonymous with two major issues:

Various browser extensions exist to help render legacy files, though they should be vetted for security. 2. Standalone Players

If a legacy version still exists on your system, it should be removed immediately to prevent security breaches.

If you are a Windows 10 user desperate to relive the glory days of Flash games, You are inviting malware onto your system.