How to recover the serial number of an installed activated Adobe Acrobat XI Standard

I have an activated Adobe Acrobat XI Standard (Version 11.0.13) on my old PC and want to get it to my new PC. As you can guess though the title, I unfortunately I lost the CD where the Product Key was. Now I want to know how to get the Serial-KEY back.

1. I've already tried with the Adobe Support, but as you know it was and is not very helpful.
2. I've also tried using free 3rd party tools like Magical Jelly Bean Keyfinder and a couple of other alteatives. But of the free Keyfinder no one has really worked. However the fee-based PRO-Keyfinder I have not tried because I don't want to pay for finding my Adobe License Key which I have already paid!
3. I have also found and tried this, but this didn't work in my case!
4. Neither I registed my the software with an Adobe-ID nor I have an Adobe account!

Generally I don't care if I get the key back by using 3rd party tools or not or by using the Windows Registry or even though a magician trick! So It no matter how I get the Key back, the only thing is, I don't want to pay money for that!

System Information:

Adobe Acrobat Standard XI Version 11.0.13 (Because of that the programm is in the x86 folder it should be the 64-bit edition)
Windows 8.1 64-bit Home Edition 2013 Version 6.3 Build 9600

PS: I know, that this post is a possible durplicate from this. To be honest that was me. I wantet to make some edits at my post, but unfortunately I forgot my password to that. So I posted a new question to be able to edit my old post. So plz don't get my wrong that this is a possible duplicate. If any moderator read this, you can delete the old post.

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