Extension installed, but invisible to Photoshop

Here's the sitch:

- I wanted to try "Animator's Toolbar Pro Trial" and clicked "Install", on the corresponding Adobe Exchange Website.

- I waited some time for the sync to happen.

- I opened Photoshop, looked in "Window > Extension" and found only "Color Themes"

I tried the above procedure three times.

Then I tried "Anastasiy's Extension Manager", as advertised by Adobe. It says that the extension is already installed and I need to first uninstall it in order to reinstall it. So I head back to Photoshop and check, but it is not visible in the menu.

I go back to the Exchange Website and click "Uninstall", wait for the sync. Try the Extension manager, but it still says that the extension is installed.

QUESTIONS:

- Should I manually remove the extension? If Yes: where? I'm on macOS Mojave.

- What would be a different approach?

FURTHER INFO:

- I just updated PS to the latest version today, Feb. 12th.