I'm downloading it now, but will wait a while to install it.
Good luck, one and all.
Also, from their site:
It is recommended that you uninstall v2.4 before installing v2.5. Additionally, if you have any issues running v2.5 it is recommend that you clear all files found in the following folders:
%PROGRAMDATA%\Lockheed Martin\Prepar3D v2
%LOCALAPPDATA%\Lockheed Martin\Prepar3D v2
%APPDATA%\Lockheed Martin\Prepar3D v2
%USERPROFILE%\Documents\Prepar3D v2 Files
Note the "if you have any issues running v2.5" part.
You may want to delete the %LOCALAPPDATA%\Lockheed Martin\Prepar3D v2 part to remove the Shaders files instead of all of the above.
You can always wipe the whole thing if it doesn't work, and re-install P3d V2.5 again.