There is a web version of Flashpoint called 9o3o on https://ooooooooo.ooo/browse. If you click a game and then open your browser devtools and search for "data-game-zip", you will find the link to the game files in that attribute. Download and extract it and go to town.
Yeah that's the biggest issue with Flashpoint. AFAIK many games are hardcoded to load files from certain URLs and Flashpoint does patches & emulations of server calls. Support for sytems other than Windows is also wonky...