Edit - corrected path
You have to add it manually.
First, close VEAI.
Open this file:
C:\Users\[username]\AppData\Roaming\Topaz Labs LLC\Video Enhance AI\models\gaia-hq-5.json
Change line 3:
"version": "5",
to
"version": "6",
Now, save the file as:
C:\Users\[username]\AppData\Roaming\Topaz Labs LLC\Video Enhance AI\models\gaia-hq-6.json
Now when you start VEAI, both Gaia v5 and Gaia v6 should appear in your model list. The program will download the files it needs as needed.