If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
List of issues
: The issue tracker is now writable again and logged users can download files too. But note that our support is very LIMITED.
#1567 Actionscript Refuses to Save
How Do you Make Actionscript Save again because its refusing to save, no errors provided.
It creates TMP files, and does not delete them. Instead, it keeps them and doesn't update the files.
make sure the file is not opened/locked in another application.