Invalid AJAX response

Can’t upgrade my new install of a grav skeleton because of “Invalid AJAX response.” also this pops up then: “Error while trying to download (code: 0): Message: URL using bad/illegal format or missing URL”
Same with theme installs.
What am I doing wrong?
I’m on Hostens shared hosting.

Did you solve the problem?

This error appears on shared hosting when an IP connection (to grav, github, or amazonAWS…) is blocked. There may be an option in your host’s control panel to unblock all or selected IPs.

Setting the Remote Fetch Method to fopen fixed this in my case:

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