Windows 10 Pro, Finale 26 Current

So, I just purchased a custom-built computer and downloaded and installed Finale 26 to it.

I also downloaded and installed GPO4 and then GPO5, in that order.

Finale default instruments, SmartMusic SoftSynth, and GPO5 show up in the Device List in Score Manager, but not GPO4.

I found a thread that is four years old that addresses this, but nothing current. I did "Manage VST Plug-in Directories" and found the VST2 folder with Garritan, but to no avail.

I did update ARIA Player to 1.959, but it is for ARIA Player x64. The (brown) ARIA player is v.09

Also, when I open Aria Player by itself, I get an error message, "Check Preferences. Maybe the current driver doesn't support this sample rate."
The sample was preset to 44199Hz

Any current ideas?

Thank you,
:-)
Vanessa