Delphi xe 10.2之安装 TServerSocket 和TClientSocket

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:

1. Select Component > .
2. In the Install Packages dialog box, click Add.
3. In the Add Design Package dialog, browse to C:\Program Files (x86)\Embarcadero\Studio\19.0\bin.
4. Select dclsockets250.bpl, and click Open.
5. Click OK to dismiss Install Packages dialog.
6. The socket components ( and ) 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.

原文：https://www.cnblogs.com/jijm123/p/14266340.html