Could be an outdated Dolphin version try upgrading that if it does not work try getting the .iso from a different website. Could be your previous iso is damaged. Good Luck!
Windows 10 x64 | Intel Core i7 4790K @ 4.4ghz | NVIDIA GeForce GTX 1070| 16GB DDR3-2400 | Bose Companion 5 | Sennheiser Momentum 2.0| Logitech G502 Proteus Spectrum
MacBook Pro Retina 15in 2014 | OS X El Capitan 10.11 | Core i7 4770HQ| Intel Iris Pro HD Graphics | 16GB-DDR3-1600
