OFFL v0.2.4 is available for download, patching a few issues and bringing compatibility for 2006. This upgrade is eligible only from v0.2.3; v0.1.x must first upgrade to v0.2 (as found in that release).
This is a drag-and-drop FTP update with database alterations that are made with the included upgrade files. Support can be found in the "Forums" as usual.