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If you wish to scale the UI without using MODS, you can. Simply open DeusEx.ini and change the following.

Root=otpUIfix.otpRootWindow

to

Root=DeusEx.DeusExRootWindow

You can also set anisotropic filtering, vsync and FOV from here as well. Just press ctrl + F and search for Anisotropy, vsync, FOV.

This should be helpful for those who prefer a vanilla experience.
Your solution not working for me. UI is still too small.