How to install a Magento 2 extension without SSH
In order to install an extension for Magento 2, normarly you have to use the command line through SSH. Howver you can install it without SSH.
For example: install PL_Payment extension
Step 1: Open Config.php file in app/etc/ then add a line code
Step 2: Add record into database, the table named setup_module .
Access directly to database by phpMyAdmin or something like that.
Step 3: Now you need to refresh or flush cache.