First right-click on the gray color "Add to Chrome" button.
A menu pops up, scroll all the way down to click "Inspect".
Now look for this line:
Right-click on this line of code.
A menu appears, and click on "Edit as HTML".
Now this particular line is boxed up.
Drag the bottom scrollbar, until you see this: disable=""
Change the word disable to enabled.
Close the Inspect Element page.
Now the gray color "Add to Chrome" button should change to blue color.
In other words, you can now click on it to install the extension.
Seems not working for Ublock Origin: https://chromewebstore.google.com/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm
I tested on a clean profile.
I don't test your tip:
But if i use the trick described in: How to enable back uBlock Origin at Chrome Web Store 2025 Use Chrome DevTools to inspect and modify the "Add to Chrome" button's code to enable the extension for installation.
I can install it.
Resume of the process: