QR6, QR506 and QRDesign are Available for RAD Studio 10.3 Rio
There is also a trial version available here:
http://ftp.qbssoftware.com/delivery/QBS/QR/Demos/QR6DXE10_3_Rio_W64_Demo_installer.exe
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There is also a trial version available here:
http://ftp.qbssoftware.com/delivery/QBS/QR/Demos/QR6DXE10_3_Rio_W64_Demo_installer.exe