Plutonium

Hystic Read the antivirus guide https://plutonium.pw/docs/antivirus/ and also try deleting the Plutonium folder in %localappdata% (while the launcher is closed) then try starting the launcher again

Hystic

try deleting %localappdata%/Plutonium try changing your dns servers (https://www.windowscentral.com/how-change-your-pcs-dns-settings-windows-10) try syncing your system time