http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Installing_Socket_Components
The socket components are not installed by default. To use the socket components, you must install the dclsockets<.bpl> package.
To install the socket components:
- Select Component > Install Packages.
- In the Install Packages dialog box, click Add.
- In the Add Design Package dialog, browse to
C:Program Files (x86)EmbarcaderoStudio19.0in. - Select dclsockets250.bpl, and click Open.
- Click OK to dismiss Install Packages dialog.
- The socket components (TClientSocket and TServerSocket) are listed in the Internet category of the Toot Palette.
Note: These steps are one-time installation instructions. The socket components should be available for all future projects.