Well, he pointed me to the website of the project, where they got it from, but there is just a newer version, not the version they put in their package. So till now I haven't been able to get the sources yet.
Don't they store older copies? Was the repackaged version modified in anyway? If it wasn't then giving a link to where they originally downloaded the copy is perfectly OK I think.
I also contacted the authors of former works. One couldn't be reached at all and the other doesn't care too much.
So, what shall I do now?
As I see it, there isn't much you can do since you are not the copyright holder.
Cheers.