@Lars Fosdal, there's this property in the .ini "SLIPFile", that is left empty. i suspect that's where the license file/path should be when the activation is done correctly. There's previous answer mentioning "Controlled Folder Access", so i thought the issue is about access right (when installing on the unsupported OS), so I start checking for irregularity and find that blank property. either way I'm stuck.
@Cristian Peța, yes the current community edition is delphi 11, i think the Delphi editor and IDE are packed inside the RAD studio 11, which is blocked by the activation issue