Package Manager suddenly stop working in Chrome or Chromium based browers? See Hotfix here
Hotfix-GRANITE-30226-1.0-1.0.1.zip
https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:de812fad-c373-4c67-bd34-a6f0b2506434
NOTE -- you will need to use Firefox or some other non-Chrome browser to install.
NOTE -- this was built for AEM 6.5
