If you ever tried to write an extension for Joomla you probably know that old components, modules, plugins and templates, for Joomla version 1.0, are not compatible with version 1.5. With some minor tweaking, you could get old extensions to run quite nicely in Joomla 1.5 if you turned on the legacy mode plugin.

However, more and more Joomla users require native 1.5 extensions only and won’t bother turning on the legacy mode. The developers convert their old extensions to new ones but they are forced to distribute them separately for different Joomla versions. Here is how you can fit them together so that the same package can be installed both on Joomla 1.0 and 1.5, without legacy mode needed. (more…)