problem with the subtitles on the "special edition" features

[tuxlu]

Hello!
I have to confess you I made a mistake: I bought the "IGTM special edition extras only"
but... on another platform than Steam.
so I bought this edition more expensive than on steam, but i tought:
"yeah, but i can download the movies without any drm, watch them without lauching Steam"
but now, i figured out that I can't have the subtitles of the special edition on this platform.

So , I don't know how it works on Steam, but if you are able to download freely the subtitles files of the special edition (.srt files) , could anyone who bought the special edition give me theses files?

thank you in advance for your help!