Plex Media Server won't install or launch on new PC – access denied on manual downloads

Server Version#:Unknown (installer won’t launch)
Player Version#:Not applicable (this is a server issue)
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

I recently switched to a new Windows PC. My Plex setup worked perfectly on my old machine, same network, no VPN running.

On the new PC:

Plex Media Server installer appears to finish but nothing opens — no UI, no tray icon, no background process.

Tried multiple versions of the installer — same issue.

Tried direct download links from downloads.plex.tv and got XML “AccessDenied” errors from S3 buckets.

No antivirus is interfering. VPN (Surfshark) is off.

I don’t have a Preferences.xml file because the server won’t even launch once.

I’ve done clean reinstalls, wiped leftovers from %localappdata%, cleared temp folders, nothing works. At this point I can’t even get the server to initialize once. Please help — I’m out of ideas.