"No Internet Connection" error during installation

This article is relevant for Windows and Apple/Mac users:

Other connection problems or DNS problems during installation?

• Ensure that your firewall/AV software does not block JDownloader or the installer
• Check for DNS blocks
• Check for VPN related problems:
  We are not blocking any VPNs but using a VPN may also cause network problems in some cases so:
  If you are using a VPN, disable it and try again.
• McAfee Total Protection Users: Disable McAffee (or configure it properly)
  How to disable it: Settings -> Network -> VPN & Filters

Tags: Install4j log may contain: "NoConnectionException: Could not Connect to"

Windows users

If you get an error during the installation that the installer cannot connect to the internet, or if you get asked to enter proxy settings although you usually connect directly to the internet, please check if any of these "potentially unwanted program (PUP)" tools are installed and remove them:

• RelevantKnowledge
• PremierOpinion

After uninstalling these tools via the Windows Add/remove software panel, the JDownloader installer will work fine.
(More details: https://malwaretips.com/blogs/remove-premieropinion/ )
You can also use tools like AdwCleaner to remove them. This is not an ad! You can remove AdwCleaner itself after running it once to remove adware!

Apple/Mac users

Check if iCloud Private Relay is active.
If so, disable it and re-run the JDownloader installation.We are still trying to find the cause of the problem/why it fails with enabled Private Relay.