tl;dr - Adding Holo Red to an older Holo May (USB 2.0) will require the USB 2.1 upgrade module if you plan to play higher than 705k.
Instructions
1) Order Holo Red
2) If your Holo May has the older USB 2.0 (open and verify XMOS = USB 2.0 & Altera = USB 2.1).
3) Contact your dealer (kitsune in US) via contact and ask for a swap, which will cost you $100 & shipping your old USB 2.0 module back.
4) Download
videos and follow instructions
5) Remove bottom 10 screws first
6) Remove rear 3 screws
7) Slowly slide back as shown in video. I didn't have to remove the ribbon if you lay it down with the screen on a cloth
8) Remove 2 screws from USB module and unplug
9) Swap and do reverse steps to reassemble
Good to go!
I made the mistake and forgot about the USB 2.0 vs 2.1 with non intel CPU's. While you wait your 4-6w, you might well do the swap. Hope this is helpful for others!