Some thoughts on this:
1-I am using a 003 rack with the very latest version of PT
2-as with ANY update or experiment; have a backup plan such as:
Save a dive image of your system drive(so you restore from the image if the update goes sour). Another BU plan(which I use a lot); clone your current system drive, swap the fresh clone into the PC and stick the old system drive in a safe place. Now update software on the cloned drive. If things go sour, swap the old drive back in(beats the heck out of starting from scratch)
. If the update goes good, work it for a month or two, then clone over the old drive you set aside(now you have a perfect backup system drive with all your software ready to go).
Last 2 cents; if your current system drive is a spinner, replace with an SSD. Assuming a large enough SSD, you can clone the spinner to the SSD(then optimize it after the clone finishes). There are several options from mounting an SSD in place of a 3.5" spinning drive. Some will insist that a 128 or 256GD SSD is big enough as drive C:, I recommend going with a 500GB(or bigger). The Samsung EVO and PRO SSD's are proven to work very nicely