I was wanting to test the Prefix mod just using the free version for awhile to see if it fits and gets used with my forums. Unfortunately it doesn't work. When i go to install the package I get an error.

"Error in Package Installation
At least one error was encountered during a test installation of this package. It is strongly recommended that you do not continue with installation unless you know what you are doing, and have made a backup very recently. This error may be caused by a conflict between the package you're trying to install and another package you have already installed, an error in the package, a package which requires another package that you don't have installed yet, or a package designed for another version of SMF"

"0.   Execute Modification   ./Themes/default/Post.template.php   Test failed
   1.   Replace   ./Themes/default/Post.template.php   Test failed"

You must manually install it, sorry but I do not help wih modifications for Lite versions

Yea  I got the same error and you can not manually install it because the code for that file does not fit properly.   

Pro version is way better, is really cheap, and support is given for it