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Nobody here will knowingly help you do something that might be illegal, immoral, destructive, or (I hope) even mildly mischievous. You haven't convinced me that what you're trying to do is...

Ah, then it's not so complicated. Ask them for help.

Then I guess you'll have to spend the next several years (or buy a supercomputer if less time is required) breaking the encryption, THEN start the decompilation which is no small feat either.

Get your "friend" to send you the source files.