This challnege is End of Support [Adobe Flash Player](https://blogs.windows.com/msedgedev/2020/09/04/update-adobe-flash-end-support/) file.
Run chalenge file round up **Goodbye old friend**
[窓の杜](https://forest.watch.impress.co.jp/library/software/hugflash/) (WINDOWS FOREST) use extract Flash file.
Run **hug flash** and **drag-and-drop** **goodbye** to extract file and you will see goodbye folder.
In the goodbye directory **goodbye.log** in the Flag.

Original writeup (https://312k.github.io/312k-blog/post/post6/brixelctf-312k-eng/#goodbye-old-friend).