I listed (on my web page) a quick way to get 3.19.... you're welcome to grab it...
shutdown all BOINC first (exit)... and then run the installer.
On first startup it will re-benchmark... it's MUCH more accurate.
When you hit 'update' for each project will update your benchmark #'s.
It will have no impact on which application you re running for each project.
I am running 3.19 w/ predictor's 3.06 app, and Seti's 3.08 (?) app.
You will find that 3.19 CC is more stable and has less upload/download problems than 3.07. It also implements high/low watermark job downloads and better HT / multi-cpu management.
Hope this helps sort out the confusion.
BC