Adobe Acrobat DC install stuck

Using a MacPro running 10.10.3

This morning Creative Cloud told me there was an update - Adobe Acrobat DC, I clicked update and the install started then stopped asking me to quit an app - can't recall the exact name but it was something like SafariCloudHelper, which I needed to quit via Activity Monitor. I continued with the install but its stuck at 35% (and has been for ages now).

Tried a restart and simply back to square one.

Any ideas?