One problem I still have is that MGEgui 3.8.2 wont open, and I have to use 3.8.0 which doesnt have the SM 3.0 options for the water.
So try to delete mgegui.exe and d3d8.dll, and re-copy them.
You can find them in the Installer_Data.7z archive.
Or maybe:
If you installed everything then you probably need to run MorrowindLauncher.exe as administrator, set the screen resolution from the options and then run MGEgui.exe as administrator.
In order to run a program as administrator you need to right-click on the executable and choose Run as administrator.
Thanks for your reviews!
I'm glad that you liked it