You might woke up one day and realised that the Add New plugin option in your dashboard no longer there. So you turn to google and search for a solution. Well, Google is helpful only if you know how to search better because there will tonnes of search results thrown infront of you and most times you will be overwelhmed and not do the right thing.
I mean, instead of fixing the issue you ended up causing more problems. WordPress has some critical files that if you do not know what your are doing you will messed up your website.
OK back to the solution, what you need to do is take a look at your wp-config.php file.
The file is located in you public_html and can be accessed through FileZilla or FileManager (there are other options aswell).
Warning! Before you tamper with the WP-CONFIG.PHP file, please download a back up of it. Trust me, it will save you from pulling all the hairs of your head. Hehe!
Once you take a back up, you can edit it with using your favorite text editor. Note, if you are opening using File Manager into the built in editor, look for the line of code, sometimes two.
All you need to do is change the boolean value to true, both of them.
That’s it.
Now go back to your WordPress Dashboard and see if the options available. So you can update your WordPress core files plus adding new plugins. Remember, if the above files have their boolean value set to off, you cannot update your WordPress version and plugins. Both disallowed so to speak.
All the best!