Did you get any error while installing? if you didn't get any error, the package should be installed automatically.
The only weird thing I see, is that usually the design-time packages are installed in the folder:
I've installed the trial in my machine, and the package is installed in the folder: C:\Users\Public\Documents\Embarcadero\Studio\17.0\Bpl
Seems the IDE is searching the package in the wrong folder.
I've downloaded the trial install exe as well. Installed without any errors but cant find the TsgcWebSocket component in tool view.
Tryied to install the packages manually leads to the following error:
Package C:\users\public\documents\embarcadero\studio\17.0\bpl\win32\dclsgcWebSocketsD10.bpl can not loaded.
The module cant found.
After I cleaned all files and re-build them i get the following error:
Package C:\users\public\documents\embarcadero\studio\17.0\bpl\win32\dclsgcWebSocketsD10.bpl can not loaded.
%1 isnt a valid Win32-Application.
The trial uses MSBuild to compile and install the package, if your path has more than 32000 characters, msbuild fails. I suggest to clean unused paths from your IDE or install the package manually following these instructions: