The "Add New" Plugin button does not appear on Wordpress admin panel

wordpress plugins

So you are facing this reason :

1) May be memory issue.

Try to increase memory :

define('WP_MEMORY_LIMIT', '256M');

2) User Role Restrictions

Check your user role. Are you performing as admin or not ?

3) You are on multi-site network.

Check your WordPress installation are you on multisite network or not

wordpress plugins

Try reinstalling WordPress. Possibly your wp core files effected from one of your plugins. Reinstalling WordPress may help,

CodeHunter