Have you set the flag as belowDidn't work.
Failed to load extension
ErrorManifest file is missing or unreadable
Could not load manifest.
YesHave you set the flag as below
chrome://flags/#extension-mime-request-handling to change from "Default" to "Install always" to make it prompt the user to install. "Default" will cause you to download the extension's crx file instead.
Enable Developer mode at the top right corner in the Extensions page
Download the zip file and extract again. The below files/folders should be in the unzipped folder. Load unpacked the unzipped folder again
View attachment 254718
If all else fail then remove the Ungoogled Chromium browser, re-download and install again. I'm using the installer version NOT the zip version.
BTW, what OS are you using?