You might look for an 'undo update' option within the app's settings. Sometimes it's hidden in a menu like 'Version History' or 'Update Settings'.
To undo the last update of the web comics app, you could try searching for something like 'Restore Previous Version' in the app's menu. Or, check if the app store from where you downloaded it offers a way to revert to an earlier version.
Well, first check if the app itself has a built-in feature to roll back the update. This could be in the app's preferences or settings section. Another option is to uninstall the app and reinstall the previous version if you have it saved somewhere.