You can upgrade your order to a Pro at any time, by simply sending an email to support@glowforge.com .
If you are asking if you can have the unit that someone else rejected, at the price they paid, or take their place in line, sadly the answer to both is no. These units aren’t built until we confirm acceptance to the “Do you want your Glowforge?” Shipping email.
Make sure you add the following email addresses to your email Contacts list so you get that email when it comes:
Hello@glowforge.com
Support@glowforge.com
Danshapiro@glowforge.com