If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
List of issues
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#1579 JPEXS is not launching on Ubuntu 18.04
> What steps will reproduce the problem? I download ffdec_11.3.0.deb from the github page: https://github.com/jindrapetrik/jpexs-decompiler/releases/tag/version11.3.0 > What is the expected output? What do you see instead? When installation is finished I try to launch but nothing happens. > What version of the product are you using? Is it "nightly build"? Which operating system do you have? I use 11.3.0 and no I don't think that it is nightly build. As I mentioned, ubuntu 18.04.
11.3.0 requires java 8, do you have java 8 installed? 11.3.0 won't work on newer javas like java 9, 10, etc.