I recently installed MO:ULa on a brand new computer that had only seen Windows 10, and ran into a few new problems that I had not seen previously. It is all covered in their forum though, but these are the new things that had to be taken care of:
- Install DirectX 9, see https://support.microsoft.com/en-us/kb/179113.
- Unzip http://account.mystonline.com/download/MOULaSupportFiles.zip and put these dlls into the same folder as UruLauncher.exe.
- Also note that at least if you use the web installer UruLauncher has to run as Administrator the first time around, to be able to install the rest of the game.