Where can i download subtitles for Media player Classic?

Answer 1

Subtitles normally come with the video file (unless you downloaded the RAW). MPC just allows you to play virtually any video, audio, and subtitle format.

The video you are trying to play might already have subs, but you just don't have them turned on.
Navigate>Subtitle Language> (choose subtitle) to turn it on.

If you are looking for subs for a series and particular, let me know and I'll go take a look.