yes you need to install windows 98 plus iso and You should click on the cd image at the bottom right of the screen, enter your files from there, select the plus iso and it will start. If you only want the themes during the installation, if you do not want other unnecessary things, press the custom option and select only the themes from there. After the installation is completed, it will ask you if you want to change the themes and it will open the theme window. You can choose the peanuts theme from the options section and discover windows 98 plus themes!