nostr:npub106dam65ww9ztdqj26xvh08dyuc7lj7nmkrtrujwsmyq2n6g3r33saq3m89 The thing is you can't, as any half decent optimizing compiler throws away enough information that you don't can't get intelligible source code no matter how good your decompiler is.

Even if you were to do that, you couldn't legally modify or distribute that software due to copyright law.

The only practical choice to escape from the shackles is to reverse engineer the software with a deassembler and write a re-implementation from scratch.