Thank you for your answer.
I have followed your advise and entered the two .bsa lignes as fallback-archives.
I have improvements when I arrive in tamriel Rebuilt : no yellow error marks in the arrival lobby... but as soon as I am out in the city, there is remaining loads of them !
On the loading consol, I have a serie of warnings : "Failed to load 'meshes\WL\F\wl_flora_bm_tree_02_nif' ; resource 'meches/wl/f/wl_flora_bm_tree_02.nif not found, using marker_error.nif instead.
Errors seems to concerne wl/flora_bm_tree 01 to 09.
I tryed to locate these files in the different mods I have installed to see if the path was wrong; didn't find them, nether in Morrowind Rebirth or in the Visual Pack Combined.
Could it be that these meshes are missing in my Tameriel Rebuilt mod ?
Also I dont understand what I have to do with :
Also, make sure the directory is available. Either you copy them in Morrowind data or add TR_DATA as a a data directory, for example, adding this.
I can't find any "openw-mods" file in my install, I asume this is the file where you extract your mods... in mine "C:\OpenMW 0.42.0\Data Files" I have installed "TamrielRebuilt_16-12" and "Tamriel_Data (HD)-44537-04. "TR_Data.bsa" is at the first level in this last folder. Should I move it out to be on the first level of "C:\OpenMW 0.42.0\Data Files" ?
Thanks for your help.