upgrade from JMW 10 to 10.5 fpr my VPI Aries 1

It's possible to upgrade from 10 to 10.5i- confirmed by VPI. Yes, adjustment is needed on the arm board.

It's certainly possible to upgrade in the sense of buying an entirely new arm, just that the 10.5i armtube will not work with the l0.0 base, or so says the VPI website.

Dave,

Thanks for your message,
VPI told me that they will replace my old 10 arm with a new 10.5i arm. Therefore I expect the armtube will be changed and, according to your experience, there should be an improvement, right ? Kim

If you're ending up with a whole new arm, then yes it should be a substantial upgrade. Good luck, Dave

Yes. I just received a whole new 10.5i arm from VPI.
Let's hope there is a substantial improvement.
Thanks everyone and Mike at VPI.