Adobe Animate cannot open a file

Hello, I'm working on an animation project. I completed one scene, saved 2 copies of the finished project in .fla format. I wanted to test out if it works well, but Animate cannot open any of those. Then I saved a new project, it was much more smaller file, and it opened without any problem. When I tried to open that finished project, it says "doesn't respond" and screen shows as loading for like 20-30 minutes then shuts down without any warning. I created the project with the version 23.0.3, couldn't open with the saem version, I installed 23.0 and it didn't work either. I then installed the versions 23.0.8 and 24.0. and lastly, 24.0.5. None of them worked. I also tried the winrar method, it also didn't work. The file is 486 MB, idk if it too big but my computer worked perfectly until the end of that project, I don't understand why it doesn't open that. I know the minimum requirement for Animate is 8GB of RAM, and I have 16GB. What can I do?