If you download a remix of a song in the charts which is only available digitally, does it count in the charts?

I think so, I remember there were remixes of shakira's HDL and they all went towards her sales

all remixes (and live versions, alternative versions, rerecordings etc) do count towards the overall sales of a song and therefore its chart position. However the running time of a single track download musn't exceed 9 minutes 59 seconds. If a version is longer than this then the download of that version won't count.