NOTE: these steps below may require Administrator privilege on your Windows machine 1) Right-click on the "cufft_patch_windows.zip" file and choose "Extract All" In the popup box, look for "Files will be extracted to this folder:" and then type in the top-level location of your CUDA 7.0 Toolkit installation, e.g. C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.0 Then hit the "Extract" button 2) If it asks you to "Confirm Folder Replace", hit the Yes button 3) If it then asks you to provide adminstrator permission to copy to this folder, hit the "Continue" button and also check the box "Do this for all current items" -- Note: the steps above will update "cufft64_70.dll" inside the path C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.0\bin and also update "cufft.lib" inside the path: C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.0\lib\x64