5. Bob's Armory 1.1, (You can use the good old esp from the original mod with the latest
FCOMBobsArmoryOblivion BSA)

I don't understand this step, I got both Bob's armory 1.1 and Fcombobsarmoryoblivion Bsa, do I need to install them both?
And also how are they related to Fcom? I mean, with that name "Fcombobsarmoryoblivion Bsa" I'm starting to think that I got to get rid of the esp regarding bob's armory inside the Fcom 0.9.9 package. Am I wrong?

Edit: I don't know if I was clear:
I got three rars:
first: Bob's armory oblivion 1.1 , where there are two esp, one cheat version and one normal version
second: FcombobarmoryOblivionBsa where there is a BSA called Bob's armory oblivion
third: FcomarmoryOblivion.esp inside fcom 0.9.9
Can someone explain how do I install Bob's armory?

Check the second page of this forum. That is where the current FCOM thread is, right now. It is never far away.

That thread is where all FCOM-related questions should go. Also, it contains (in the first post) all the installation instructions you need, some in the form of links.

edit: Never mind that part...