Upgrading to a new version depends on the time of purchase. If a year has passed already, you must buy the annual software maintenance (so you get an extra year worth of upgrades/support). If you are within the year, you can upgrade at no cost.
fop2 includes an index_only_extensions.html file that you can use to hide the right column and use all the screen for extensions. Version 2.27 will be able to do this automatically (expand extensions if there is no items on the right hand side).
Best regards,
