Only stable releases have installers, unless something's changed recently, so instead of running the installer after extracting, it should just tell 7zip to extract the contents over the existing Dolphin folder. If it doesn't find 7zip then it should echo "No Dolphin for you, heathen!" and then quit.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
