can't download photoshop cc on my macbook

Make sure you are extracting the files in administrator or else it will have problems, if that's okay then may be the downloaded files have a problem and that's why getting error while extracting them. Could you please download Photoshop CC as a trial version and then activate by signing in.

Link to download: http://prodesigntools.com/adobe-cc-direct-download-links.html and choose Photoshop from the list. Please follow the Very Important Instructions from there or else download will not start.

Regards

Rajshree