Installing SMF Mods from Admin->Packages option, sometimes, is not a pleasant task even if you want to install with the default theme. Root of the problem lies in the way SMF Mods are developed. Most of the Mods need to rely on search and add/replace method and sometimes copying of some Mod specific extra files. It is the assumption made in the design of the search string that creates the problems most of the time. Because the search string may not match in situation where a previously installed Mod might have changed the string already. As a result Mod installation test will fail and Admin has to manually install the Mod.
Manual installation of SMF Mods have been detailed here.
