Try using the trovetools.net program it's really easy, or you can even extract the files from tmod using the program if you so wish.

I've only released it as a .tmod, so not sure what you have downloaded? 

But i only can download this

http://prntscr.com/cysou5

Called only as "Boss" without any specific infos, if i move it into Trove Mods Ordner it says this: http://prntscr.com/cysqem

on an other mod i got the .tmod but not of KarmaBar and Boss health D:

it is in tmod just not named correctly,

rename the file into:

Boss health.tmod

that works for me alteast.

Still not sure what's going wrong on your end, it seems like file is downloaded incorrectly somehow? Anyway hope its sorted now, if you renamed the files it should work.

You know I was thinking this while doing it, that something was "off" but didn't try it the other way. I think you're right though I'll make the change when there's a few more things to update.

Sadly not, because the way it works is by calculating the damage done to the boss each second / start of the fight. You can only calculate how much the whole team is doing. If you want to test your own dps you can always try doing st solo. Other than that hope the devs implement more functionality into the base game.