Bought FSUIC4 early on and used it through reinstall of Windows, upgrade of Windows, reinstall of fsx. Unfortunately my Windows 7 -64 crashed and I had to upgrade to Windows (ugh) 8.1. Am attempting to reinstall the FSUIPC4 I had saved in another drive. Don't have my registration key - have the WIDE and its key, but can't find my original receipt and key #. Any relief or do I need to repurchase FSUIPC? If so will the new one work with old WIDE?