Just checked installation of RxNew from Online-Package-Manager with Laz 2.0.10/fpc3.2.0/64 bit, and did observe a compilation error in unit ex_rx_xml_datapacket.pas: at line 137 there is a {$IFDEF FPC_FULLVERSION > 30200}. This is not correct, replace the {$IFDEF by {$IF, and the package will compile.