-
Open in Delphi
packages/delphi/AllPackages.groupproj
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Make sure your platform is "Windows 32-bit" (Delphi IDE is 32-bit right now, so installed packages must be 32-bit too).
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Right-click on
castle_engine.bpl
and select "Install". -
Right-click on
castle_engine_design.bpl
and select "Install".