The setup will not install if you already have 18.104.22.168 version. The setup is to downgrade the GTA 4 version to 22.214.171.124
The third file must be replaced in order to make the menu visible as it contains fonts.
Of you are getting another issue then tell me in the comment box
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So we are going to fix the lags of GTA 4 again.
With this files you will get 50+ FPS. Even if you increase your graphics settings the performance of the game will not bad
Link of the file–