downgrade cc2017 for cc2015

Updated the PPcc2015 for PP2017, since then I have had many problems since taking a scale the images or texts and any file that I need to use the scale to render and export. I paid my software in business in Brazil and for me not stay a few more days without work need to take a dawngrade to the previous version. Can someone help me?

I'm using mac.

Thanks people!