Hello
1) What version of Photoshop do you have? Photoshop CS6 or Photoshop CC?
2) Could you please tell us what the error message says? or provide a screen capture.
3) Is the download of Photoshop completing or ending suddenly
4) Where have you bought your copy of Photoshop from
5) Are you using Windows and if so what Operating System?
6) Are you using Apple Mac and in which case what Operating System?
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Terri