Problems Installing Adobe Acrobat XI

On January 5, 2013, I purchased Adobe Acrobat XI Pro (Order #AD006633602) for $ 222.88 US funds. Recently I decided to wipe my HDD and install Mac OS 10.11.3 El Capitan. I then began the slow process of loading all my Applications. When I came to re-installing Adobe Acrobat XI, I downloaded the Program this evening and installed it. When asked for my Serial #, I typed it in, but then the installer said I needed a qualifying product: “To use this serial number, you must own one of these qualifying products. Please choose the one you own and enter its serial number.” The so called qualifying products are: Adobe Acrobat 8,9, X I believe the installer is wanting a qualifying serial number because it thinks I bought Adobe Acrobat XI as an upgrade. To be honest, I cannot recall if in fact that was the case, but I am unable to find any records in my Adobe file on your web site that indicates I purchased an earlier version of Adobe Acrobat. The only other Adobe Products that I’ve purchased has been Adobe Photoshop Lightroom 4 & 5, both for the Mac, so I am puzzled as to why the Adobe Acrobat XI installer is insisting I provide a serial number for an earlier version of Adobe Acrobat