Prometheus_ConanOutfits.bsl
I do not know what bsl stands for (Bethesda Softworks List ?), or what it does, but I think for steamworks users you need to include it.
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Also may I make a suggestion - When you rar the files, could you bring the data folder up one level in the archive ..
Right now you pack the archive like this
Prometheus_Conan_Outfit \
|-- Data \
|---- Files
So when a modding utility looks inside there, it needs to be changed to ..
Data \
|-- Files
Here is how I have been re-packing your files for use with Wrye Bash (which does not recognise your top level folder)
http://www.bild.me/bild.php?file=9482453Untitled.png
I know that Nexus Mod Manager will be able to handle an archive packed in this way too ...
However I dont know if steam works will.
But just making the suggestion for change so that hopefully all possible ways of installing the files will be successful, no matter what utilities a user is employing.

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Tested the 6.1, unfortunately still have the same problem with the pendant, boots and armour ...
http://www.bild.me/bild.php?file=8954367ScreenShot5.png
http://www.bild.me/bild.php?file=9284671ScreenShot6.png