Download MeldaProduction universal installer, run it and make sure you select MSoundFactory to be installed.
You will get MSoundFactoryLE when the fully-functional MSoundFactory 15-days trial version expires.

Make sure MPluginManager installs MSoundFactoryEssentials too. (This usually happens automaticaly. In rare cases when it does not, please click MSoundFactory and MDrummer Addons tab in MPlugin Manager, select and install.)

MSoundFactory instruments may require drum samples and other resources created for MDrummer. MDrummer may actually be hosted inside MSoundFactory. To make sure everything works well, it's recommended to install all MDrummer addons

Same as with the essentials addon, install the MDrummer addons using MDownloader (preferred) or manually.

You can get some additional exciting instruments from here: