Corrupted fla files in adobe animate

[fynn_6405]

Just yesterday when I tried to open the fla files for my HSC majorwork animation it came up with "error in opening file". I looked into this a bunch on different forums and tried to repair them with winRAR by converting them to a RAR file, but the error message "found corrupted header" appeared and the same thing happened when reopening the files after converting them back to fla. I've tried a number of other solutions like converting the files to a ZIP and using diskinternals ZIP repair them but it still didn't work. I also tried updating animate and media encoder and turning my computer on and off again. I tried using EaseUS but that costs money to save the files so I haven't yet. One of the files that was corrupted was a recovery file, and the latest version of the animation I have is from a few months ago meaning I would lose months worth of progress. I'm desperate to try and fix this, as my major work is due only 3 weeks away and I still have a lot more to do with it. Is there any possible way anyone could help me or give advice? I'll provide one of the files below. 

[kglad]

look for a backup and learn to prevent in the future.

[n. tilcheff]

You worked hard on an important project for months without creating any copies or backups?

I tried to repair your file, but is seems to be corrupted beyond salvation.

Good luck with redoing your project!

[fynn_6405]

thank you so much for trying to fix it, but I ended up going into version history in Onedrive and redownloaded a previous version and majority of my stuff was still there! 

[n. tilcheff]

What a relief!

Save frequently versions of your work as you progress to prevent this from happening to you again.

[kglad]

the versions must have different names or locations.  the easiest is names:

project1_v000.fla, project1_v001.fla, project1_v002.fla etc.  periodically close and open the latest version.  if it opens without problem, you can delete the previous versions.