How to recover license key (file lost)

about half a year ago I bought a silverback license. Now I need to change my computer and want to take with me the silverback installation. Unfortunately I cannot find the lincense file, I only have the the bill which was sent to me (containing the "Belegnummer"). I also searched for the file "silverback-license.clsblicense" but without success. Maybe I deleted this file...

How can I recover my license file? Please help.

Thanks a lot.
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