The help says "You can use GetIt Package Manager to discover and install additional third-party software onto RAD Studio." but Indy is not available in GetIt
I dowloaded newest files from Github. I run the Fullc_Rio.bat file then opened Indy260.groupproj but when compiling I got:
[Fatal Error] Cannot compile package 'IndySystem260' which is currently required by Delphi 10.3.
Indy is already installed in Rio during the product installation. It's used in parts of the RTL. It's already installed in all versions of Delphi.
If you open a new VCL or FMX application, click on a form to activate the designer, and go to the component palette, and enter TId in the search box, you can find the Indy related component pages in the palette.