If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
NEW : We have got a new blog where we post some interesting SWF internals info.List of issues
#1819 SWF To FLA not Working
> What steps will reproduce the problem? using certain flash files, may be related to size > What is the expected output? What do you see instead? to export the swf as a flash file that can be edited > What version of the product are you using? Is it "nightly build"? Which operating system do you have? 15.1 windows 10 64 bit > Please provide any additional information below. If the problem is related to a SWF file, attach it here, otherwise we can't help you. This flash file is about 29 MB which is the largest, I'm not sure if that's the reason why it doesn't work. there are no errors that are thrown, whenever I convert it shows the progress but then never makes a file. similar files from the original author seem to work but this one doesn't.
[ZONE]kill-la-kill-matoi-ryuko.swf (29,854 KiB)