Error while loading EN version of DCP

[kosmos]

Hello all DCP-o-matic fans.
I have issue with loading english version of DCP. See attachment:

unresolved.png

Main folder of original DCP (IT-XX) version contain these files:

maintree.png

And IT-EN version folder contain:

tree.png

I would like to load version with english subtitles, add polish subtitles and Make DCP version with both polish and english subtitles on the screen at the same time. Is it possible?
I found out that I can load IT-XX version without any problems, then I can load english subtitles from all 8 reels. Then I have to put all of them in correct order in timeline. Should I add polish subs the same way and align them with english ones. I think it is all to complicated.

Is there any way to just load IT-EN version with english subtitles already loaded and then load srt file with polish subs in one file or 8 files (8 reels) of polish subtitles in DCP .xml format?