@seadad9903: It's not a tweak in the Calibre tweak sense, it's the full plugin, tweaked
. Install it like you would any other plugin (manually).
And, yes, you absolutely need CM on FW 5.x, that's what does the actual heavy lifting
.
Keep in mind that CM's support for FW 5.4.2 is partial right now (cf. the latest posts in the CM thread).