I have already bought the Adobe Acrobat Standard DC, but as I had downloaded the Adobe Acrobat Pro DC before, even if I had already deleted it, every time after I completed the install progess for Acrobat Standard, I got a Acrobat Pro and it was still a trial version.
properly uninstall (don't delete) everything cc including the cc desktop app, Uninstall the Adobe Creative Cloud desktop application
clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html
restart your computer (don't skip this)
reinstall the cc desktop app, https://creative.adobe.com/products/creative-cloud after siging-in with your subscription adobe id.
use the desktop app to install your cc programs/trials
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