You are not on the official 4.0.1. Dolphin hasnt used plug-ins in a VERY long time to my knowledge.
Please click and install this link directly: http://dl-mirror.dolphin-emu.org/4.0.1/dolphin-x86-4.0.1.exe
This is for the 32 bit Windows installer
Please click and install this link directly: http://dl-mirror.dolphin-emu.org/4.0.1/dolphin-x86-4.0.1.exe
This is for the 32 bit Windows installer
i5-8600K @ 4.5 GHz
GeForce GTX 1080 SC2
ASRock Z370 Taichi LGA 1151
CORSAIR Vengeance LPX 16GB 2400 DDR4
SAMSUNG 970 EVO M.2 500GB PCIe SSD
Indigo Xtreme TIM
Phanteks Pro ES614P Black Steel Case
EVGA SuperNOVA 750W PSU
Windows 10 64-bit
GeForce GTX 1080 SC2
ASRock Z370 Taichi LGA 1151
CORSAIR Vengeance LPX 16GB 2400 DDR4
SAMSUNG 970 EVO M.2 500GB PCIe SSD
Indigo Xtreme TIM
Phanteks Pro ES614P Black Steel Case
EVGA SuperNOVA 750W PSU
Windows 10 64-bit