If things go wrong, some information may be available in the log file of the App, or in the log files of Assetto Corsa.

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To view the log file, open Windows Explorer from your Start Menu.

The type the following into the address bar and then press Enter:
%AppData%\IconXLauncher\Launcher.log

The log file should now appear in your default text editor.

To open the folder that has the log file, type this instead:
%AppData%\IconXLauncher

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The log file for the Custom Shaders Patch can sometimes contains helpful information.

To open this log file, use the steps above, but type the following into Windows Explorer:

%HOMEPATH%\Documents\Assetto Corsa\logs\custom_shaders_patch.log

Alternatively, you can open the log file by opening Windows Explorer and going to:
Documents, Assetto Corsa, logs, and then open the file custom_shaders_patch.log.