As discussed in another thread, I'm uploading the source code for the current installer. It requires Microsoft Visual Studio (I used 2010 version, probably will work with newer ones as well).
How to use:
1.) Unpack the archive in a separate folder
2.) Place Morrowind_ob.esm in "MorroblivionInstaller\Resources" folder
3.) Double-click MorroblivionInstaller.sln to open it in Visual Studio
4.) When it loads select Build->Build Solution in Visual Studio menu
5.) Grab MorroblivionInstaller.exe from "MorroblivionInstaller\bin\Release" folder. Other files can be ignored