V2 extension missing in Illustrator
If you are able to open the Overlord 2 extension in After Effects but Illustrator, this is for you.
Enable debug mode

Download ZXP/UXP Installer from aescripts + aeplugins
Open settings
Navigate to CEP settings
✅ Enable debugging
Restart Ai
If that doesn't work, try the next option ↓
Install an Illustrator workspace with Overlord open
Download the workspace with Overlord visible
Unzip the download to find the file
overlord-2
Navigate to the Illustrator workspaces folder
Windows:
C:\Users\[username]\AppData\Roaming\Adobe\Adobe Illustrator [version number] Settings\[locale (e.g. en_US)]\x64\Workspaces/
macOS:
/Users/[username]/Library/Preferences/Adobe Illustrator [version number] Settings/[locale (e.g. en_US)]/Workspaces/
Copy the
overlord-2
workspace file into this folderRestart Illustrator
Click the workspaces menu in the top right of Ai
Enable overlord-2

The layout of panels will rearrange but you should now be seeing the Overlord panel. Rearrange your layout as you see fit.
Why is the happening?
There seems to be some kind of bug in the recent builds of Illustrator that doesn't let certain extensions open. But if they are already open, it seems to trick Ai into realizing that it's ok to run that extension. After opening the workspace, you should be all set moving forward.
This happens on some machines and it's still a mystery why.
A really clever community member on Discord discovered this one.