Adobe Flash Player v12.0.0.77 final x86 x64 repack refers to a bundled, community-modified installer of the legacy Flash Player. Originally released by Adobe in March 2014
Ruffle (Emulator): An open-source Flash Player emulator that runs in your browser or as a standalone app. It is much safer because it does not use the original, vulnerable Flash code.
The software package titled "Adobe Flash Player v12.0.0.77 Final x86 x64 Repack" is a specialized, third-party distribution of the legacy Adobe Flash Player software. In the current technology landscape, where Adobe Flash has reached its official End of Life (EOL), such "repacks" are often sought by users who still need to access legacy web content or standalone Flash applications. What is a "Repack"? adobe flash player v120077 final x86 x64 repack
"Repack" versions from third-party sources are unofficial and often bundled with malware, adware, or viruses. Security Vulnerabilities:
Browser lockdown: If you open a browser, immediately disable internet access via firewall or unplug Ethernet. Use a portable browser (like Firefox 52 ESR) that still supports NPAPI. Adobe Flash Player v12
Further Reading:
Original Adobe versions newer than 32.0.0.371 include a "kill switch" that prevents them from playing any content. Browser Incompatibility: How to convert SWF to HTML5 with Google
Compatibility Issues: Incompatibility with newer web browsers or operating systems.