private static void loadPreviousInstallationPreferences() throws IOException {
		try (FileInputStream fis = getAlternateFileInputStream()) {
			if (fis != null) {
				previousProperties.load(fis);
			}
		}
	}
Initialize properties by reading name, values from the given filename.
@param pathName name of preferences file to read in; could be null
@throws IOException if there is a problem reading the file
Ghidra/Framework/Generic/src/main/java/ghidra/framework/preferences/Preferences.java