Hi @sohailkmu,
Currently there is no way for the plugin to automatically install itself without using the PHP exec() function. (This requirement may be relaxed in the future – see Reduce dependency on `exec` · Issue #7083 · pkp/pkp-lib · GitHub If you’re able, I’d recommend temporarily enabling the exec() function, installing the plugin, then disabling exec() afterwards.
Regards,
Alec Smecher
Public Knowledge Project Team