Turns out License Level is apparently determined by either the RAID BIOS or more likely by the existance of an array.
I ended up turning on RAID BIOS (even though I wasn't planning on booting from the array) so that I would be prompted to enter Ctrl R to get to the Array Setup UI.
Once there, I made my 3 member RAID 5 array, set the single SSD drive (in Legacy mode) as the higher Boot Priority, and was then able to even turn off RAID BIOS (it slows down the boot a bit).
Now, when I go to the GUI, I see "License Level 50 - RAIDXpert2 Plus" and the submit button is now active.
BTW - I later ran into a new problem - there a conflict between the apache httpd server and a VMWare Workstation service: they both try to Listen on port 443. The first one there wins.
When VMWare is the winner, Apache won't even start - doesn't say why until you try running it manually. Once I figured out it wasn't getting port 443 (knowing that it had, earlier in the evening), a quick trip to Resource Monitor showed the conflicting service.
Oh, last issue: When installing RAIDXpert, if you have more than 1 drive letter, all of the Apache conf files default their paths to "E:/Program Files/RAID...". This is strange, because they do that even when I only had 2 drive letters, C & D (Ramdisk on D). Once I killed the ramdisk and reinstalled, the files correctly pathed to C:/Program Files (x86)/RAID...
This (last issue) drove me nuts for about an hour.
Finally got a look at the GUI. Wow - looks kinda crappy compared to the original RAIDXpert. Guess the functionality is similar, except RAIDXpert2 doesn't have the scheduling features (like, to do a scan once a week) that the original one had. Nope. Instead, RAIDXpert2 focuses on monetizing things, with it's 4 tiers of licensing. Great. And there I was, hoping for a real feature, like the ability to view the SMART stats of RAID array members. Silly me.