For using the optional adapter, you should also install library in addition to the adapter installation.
For installation method of the library, please refer to the "Library Installation" of the corresponding adapter, described in the Help.
It is possible to check whether library has been installed or not using server.log available during DataSpiderServer start-up. If the below message is output then it should be understood that library is not installed.
05/17 14:27:04|INFO|ds.boot|Module[${Adapter name}] is initialized.
05/17 14:27:04|WARN|ds.boot|Module[${Adapter name}] initialization has failed, but process has continued.
com.appresso.ds.common.dp.LibraryIsRequiredException: The required libraries could not be loaded. [Necessary library:${Library name}]
・For details on server.log, refer to the following.