Upgrade not working

Trying to upgrade CCleaner Pro from 5.50.6911 to 5.51.6939 and it stops at install of the exe file... get error in attached screen shot.

Doc2.pdf

Try this, seems to be working for allot of people lately:

https://forum.piriform.com/topic/53111-fail-to-install-ccleaner-pro-v5516939/?do=findComment&comment=302097

P.S. It's better to post an image format like .gif, .jpg, .png on forums, people are very leary about opening a PDF from an unknown source as that can result into getting a malware infection.