I have had similar issues with my ISP but I couldn’t fix it even after clearing the browser cache, flushing the DNS, change browser, switch to another machine. Nothing worked. I had the same errors as in the screenshot below.
Finally, I’ve found another way that worked perfectly for me.
1. Open the file C:\Windows\System32\drivers\etc\hosts
2. Add these two lines at the end of the file:
22.214.171.124 extensionscdn.joomla.org # JED ISSUE
126.96.36.199 extensions.joomla.org # JED ISSUE
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