I just used both of the files in the CM7 post. Here are the steps I followed to update to 4.6.8 successfully.
I downloaded RSDlite 4.9 with Driver found
Droid Pro SBF File (2.26.20) Full and RSDLite
Downloaded the 3.8.7 and the 4.6.8 from
http://www.droidforums.net/forum/droid-pro-roms/175390-new-cyanogenmod-7-gingerbread-kernel-22.html#post1790328
I renamed the 4.6.8 to update.zip and moved to the root folder on my Droid Pro (this was important later)
Move 3.8.7 to the root of your computer drive (C:\)
I ran RSDlite and updated to 3.8.7 using the "While phone is off" instructions on my first link (RSDlite download)
Got stuck in a bootloop after the update
Booted into recovery mode on the Droid Pro (Turn phone off, then Hold down Power + R + M until you get to the yellow exclamation point)
Ran the update.zip (4.6.8 update)
Booted successfully (*228 to reactivate on Verizon network)
Up and running the latest 2.3.3 4.6.8 now. Thanks everyone.