My copy of Civilisation IV: Beyond the Sword has finally come in the mail to-day. I went to install it, and while installation started like normal, after verifying that I have DirectX (I have DirectX 11), it says that it will check for a patch. It then says that no patch can be found and then aborts the installation (using the word abort). I use a 64-bit Windows 7 O.S.; what is going on and how can I get BtS on my computer? Should it be relevant, I obtained my copy of Civ IV Vanilla from the Civilisation Chronicles.