It is not a module. There is the normal FreePBX 13 to 14 upgrade module for users not on the distro but when you install it and try to use it says you have a FreePBX Distro and need to follow the wiki and link to wiki which at the very top says it’s beta.
The reason you need to use the upgrade scripts is FreePBX requires PHP 5.6 that is only available on SNG7 and not the old unsupported SHMZ OS 6 so we need to first upgrade the OS and all the packages.